Update version

Author: SNakano

.travis.yml

@@ -8,9 +8,10 @@ php:
   - 5.3
   - 5.4
   - 5.5
+  - 5.6
 
 before_script:
   - echo "extension = memcache.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini
   - echo "extension = memcached.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini
   - echo "extension = redis.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini
-  - composer install
+  - composer install

composer.json

@@ -19,6 +19,7 @@
     },
     "suggest": {
         "ext-apc": "APC >= 3.1.6 to use the APC storage adapter",
+        "ext-apcu": "APCu >= 4.0.0 to use the APC User Cache",
         "ext-memcached": "Memcached >= 1.0.0 to use the Memcached storage adapter",
         "ext-redis": "Redis >= 2.2.4 to use the Redis storage adapter"
     }