Merge branch '57-update-framework-and-dependencies' into 'master'

Resolve "Update framework and dependencies"

Closes #57

See merge request !51

composer.json

@@ -10,7 +10,7 @@
         "doctrine/doctrine-bundle": "^2.1",
         "doctrine/doctrine-migrations-bundle": "^3.0",
         "doctrine/orm": "^2.7",
-        "jwilsson/spotify-web-api-php": "^5.4",
+        "jwilsson/spotify-web-api-php": "^6.0",
         "phpdocumentor/reflection-docblock": "^5.2",
         "sensio/framework-extra-bundle": "^5.6",
         "symfony/apache-pack": "^1.0",