Update DEFAULT_POSTGRES_MAX_POOL_SIZE

Even though ``0`` is documented as the max pool size in the aiopg docs, setting it to 0 causes an exception in `aiopg.pool.Pool._fill_free_pool`:

```
  File "/Users/gavinr/Source/PSE/anabroker/env/lib/python3.7/site-packages/aiopg/pool.py", line 208, in _fill_free_pool
    if override_min and self.size < self.maxsize:
TypeError: '<' not supported between instances of 'int' and 'NoneType'
```

Set to the same default as aiopg, @ 10.

README.rst

@@ -21,28 +21,28 @@ Configuration
 -------------
 The following table details the environment variable configuration options:
 
-+---------------------------------+--------------------------------------------------+-------------------+
++---------------------------------+--------------------------------------------------+-----------+
 | Variable                        | Definition                                       | Default   |
-+=================================+==================================================+===================+
++=================================+==================================================+===========+
 | ``POSTGRES_URL``                | The PostgreSQL URL to connect to                 |           |
-+---------------------------------+--------------------------------------------------+-------------------+
++---------------------------------+--------------------------------------------------+-----------+
-| ``POSTGRES_MAX_POOL_SIZE``      | Maximum connection count to Postgres per backend | ``0`` (Unlimited) |
+| ``POSTGRES_MAX_POOL_SIZE``      | Maximum connection count to Postgres per backend | ``10``    |
-+---------------------------------+--------------------------------------------------+-------------------+
++---------------------------------+--------------------------------------------------+-----------+
 | ``POSTGRES_MIN_POOL_SIZE``      | Minimum or starting pool size.                   | ``1``     |
-+---------------------------------+--------------------------------------------------+-------------------+
++---------------------------------+--------------------------------------------------+-----------+
 | ``POSTGRES_CONNECTION_TIMEOUT`` | The maximum time in seconds to spend attempting  | ``10``    |
 |                                 | to create a new connection.                      |           |
-+---------------------------------+--------------------------------------------------+-------------------+
++---------------------------------+--------------------------------------------------+-----------+
 | ``POSTGRES_CONNECTION_TTL``     | Time-to-life in seconds for a pooled connection. | ``300``   |
-+---------------------------------+--------------------------------------------------+-------------------+
++---------------------------------+--------------------------------------------------+-----------+
 | ``POSTGRES_QUERY_TIMEOUT``      | Maximum execution time for a query in seconds.   | ``60``    |
-+---------------------------------+--------------------------------------------------+-------------------+
++---------------------------------+--------------------------------------------------+-----------+
 | ``POSTGRES_HSTORE``             | Enable HSTORE support in the client.             | ``FALSE`` |
-+---------------------------------+--------------------------------------------------+-------------------+
++---------------------------------+--------------------------------------------------+-----------+
 | ``POSTGRES_JSON``               | Enable JSON support in the client.               | ``FALSE`` |
-+---------------------------------+--------------------------------------------------+-------------------+
++---------------------------------+--------------------------------------------------+-----------+
 | ``POSTGRES_UUID``               | Enable UUID support in the client.               | ``TRUE``  |
-+---------------------------------+--------------------------------------------------+-------------------+
++---------------------------------+--------------------------------------------------+-----------+
 
 Requirements
 ------------

VERSION

@@ -1 +1 @@
-1.0.1
+1.0.2

docs/configuration.rst

@@ -3,25 +3,25 @@ Configuration
 :py:mod:`sprockets-postgres <sprockets_postgres>` is configured via environment variables. The following table
 details the configuration options and their defaults.
 
-+---------------------------------+--------------------------------------------------+-------------------+
++---------------------------------+--------------------------------------------------+-----------+
 | Variable                        | Definition                                       | Default   |
-+=================================+==================================================+===================+
++=================================+==================================================+===========+
 | ``POSTGRES_URL``                | The PostgreSQL URL to connect to                 |           |
-+---------------------------------+--------------------------------------------------+-------------------+
++---------------------------------+--------------------------------------------------+-----------+
-| ``POSTGRES_MAX_POOL_SIZE``      | Maximum connection count to Postgres per backend | ``0`` (Unlimited) |
+| ``POSTGRES_MAX_POOL_SIZE``      | Maximum connection count to Postgres per backend | ``10``    |
-+---------------------------------+--------------------------------------------------+-------------------+
++---------------------------------+--------------------------------------------------+-----------+
 | ``POSTGRES_MIN_POOL_SIZE``      | Minimum or starting pool size.                   | ``1``     |
-+---------------------------------+--------------------------------------------------+-------------------+
++---------------------------------+--------------------------------------------------+-----------+
 | ``POSTGRES_CONNECTION_TIMEOUT`` | The maximum time in seconds to spend attempting  | ``10``    |
 |                                 | to create a new connection.                      |           |
-+---------------------------------+--------------------------------------------------+-------------------+
++---------------------------------+--------------------------------------------------+-----------+
 | ``POSTGRES_CONNECTION_TTL``     | Time-to-life in seconds for a pooled connection. | ``300``   |
-+---------------------------------+--------------------------------------------------+-------------------+
++---------------------------------+--------------------------------------------------+-----------+
 | ``POSTGRES_QUERY_TIMEOUT``      | Maximum execution time for a query in seconds.   | ``60``    |
-+---------------------------------+--------------------------------------------------+-------------------+
++---------------------------------+--------------------------------------------------+-----------+
 | ``POSTGRES_HSTORE``             | Enable HSTORE support in the client.             | ``FALSE`` |
-+---------------------------------+--------------------------------------------------+-------------------+
++---------------------------------+--------------------------------------------------+-----------+
 | ``POSTGRES_JSON``               | Enable JSON support in the client.               | ``FALSE`` |
-+---------------------------------+--------------------------------------------------+-------------------+
++---------------------------------+--------------------------------------------------+-----------+
 | ``POSTGRES_UUID``               | Enable UUID support in the client.               | ``TRUE``  |
-+---------------------------------+--------------------------------------------------+-------------------+
++---------------------------------+--------------------------------------------------+-----------+

sprockets_postgres.py

@@ -19,8 +19,8 @@ DEFAULT_POSTGRES_CONNECTION_TIMEOUT = 10
 DEFAULT_POSTGRES_CONNECTION_TTL = 300
 DEFAULT_POSTGRES_HSTORE = 'FALSE'
 DEFAULT_POSTGRES_JSON = 'FALSE'
-DEFAULT_POSTGRES_MAX_POOL_SIZE = 0
+DEFAULT_POSTGRES_MAX_POOL_SIZE = '10'
-DEFAULT_POSTGRES_MIN_POOL_SIZE = 1
+DEFAULT_POSTGRES_MIN_POOL_SIZE = '1'
 DEFAULT_POSTGRES_QUERY_TIMEOUT = 120
 DEFAULT_POSTGRES_UUID = 'TRUE'
 
@@ -368,14 +368,14 @@ class ApplicationMixin:
             return self.stop(loop)
         self._postgres_pool = pool.Pool(
             os.environ['POSTGRES_URL'],
-            minsize=int(
-                os.environ.get(
-                    'POSTGRES_MIN_POOL_SIZE',
-                    DEFAULT_POSTGRES_MIN_POOL_SIZE)),
             maxsize=int(
                 os.environ.get(
                     'POSTGRES_MAX_POOL_SIZE',
                     DEFAULT_POSTGRES_MAX_POOL_SIZE)),
+            minsize=int(
+                os.environ.get(
+                    'POSTGRES_MIN_POOL_SIZE',
+                    DEFAULT_POSTGRES_MIN_POOL_SIZE)),
             timeout=int(
                 os.environ.get(
                     'POSTGRES_CONNECT_TIMEOUT',