Restricting allowed version of GraphQLite with this bundle.

The bundle is accessing to inner classes of the package whose signature may move in the future.
Let's admit that for each minor version, we will have a minor version of the module. This will be easier to maintain.

Author: moufmouf

composer.json

@@ -17,7 +17,7 @@
   ],
   "require" : {
     "php" : ">=7.1",
-    "thecodingmachine/graphqlite" : "^3",
+    "thecodingmachine/graphqlite" : "~3.0.0",
     "symfony/framework-bundle": "^4.1.9",
     "doctrine/annotations": "^1.6",
     "doctrine/cache": "^1.8",