fix(package): update graphql to version 0.12.2

Closes #11

Author: greenkeeper[bot]

package.json

@@ -29,7 +29,7 @@
   },
   "homepage": "https://github.com/graphcool/graphql-schema-transform#readme",
   "dependencies": {
-    "graphql": "^0.11.2",
+    "graphql": "^0.12.2",
     "lodash": "^4.17.4",
     "minimatch": "^3.0.4"
   },