Added docs how to use Symfony cache (#166)

* Added docs how to use Symfony cache

* Ony test doctrine stuff

* Moved comment

.travis.yml

@@ -25,13 +25,13 @@ matrix:
     - php: 7.0
       env: TEST_COMMAND="composer test-ci" COMPOSER_FLAGS="--prefer-stable --prefer-lowest" SYMFONY_VERSION=3.3.* COVERAGE=true
     - php: 7.0
-      env: TEST_COMMAND="phpunit" COMPOSER_FLAGS="--prefer-source" SYMFONY_VERSION="3.3.* phpunit/phpunit:^5.7"
+      # We need `--prefer-source`, otherwise the `Doctrine\Tests\OrmTestCase` class won't be found.
+      env: TEST_COMMAND="phpunit --testsuite doctrine" COMPOSER_FLAGS="--prefer-source" SYMFONY_VERSION="3.3.* phpunit/phpunit:^5.7"
     - php: 7.1
       env: SYMFONY_VERSION=4.0.*
 
 before_script:
     - composer require symfony/symfony:${SYMFONY_VERSION} --no-update
-    # This command must be run with `--prefer-source`, otherwise the `Doctrine\Tests\OrmTestCase` class won't be found.
     - composer update $COMPOSER_FLAGS
 
 script:

Resources/doc/cache.md

@@ -48,3 +48,42 @@ servies:
 ## Installing a PSR16 cache
 
 You may use any adapter from [PHP-cache.com](http://www.php-cache.com/en/latest/) or `symfony/cache`. 
+
+## Using Symfony cache
+
+Symfony 3.3 does not support SimpleCache, but fear not. You can use a bridge between PSR-6 and PSR-16. Install the 
+[bridge](https://github.com/php-cache/simple-cache-bridge) by:
+
+```bash
+composer require cache/simple-cache-bridge
+```
+
+Then register a service: 
+
+```yaml
+# services.yml
+app.simple_cache:
+    class: Cache\Bridge\SimpleCache\SimpleCacheBridge
+    arguments: ['@app.cache.acme']
+```
+
+Then configure the framework and the bundle. 
+
+```yaml
+# config.yml
+framework:
+    cache:
+        app: cache.adapter.redis
+        pools:
+            app.cache.acme:
+                adapter: cache.app
+                default_lifetime: 600
+
+bazinga_geocoder:
+  providers:
+    my_google_maps:
+      factory: Bazinga\GeocoderBundle\ProviderFactory\GoogleMapsFactory
+      cache: 'app.simple_cache'
+      cache_lifetime: 3600
+```
+