fix(deps): update dependency graphql-yoga to v0.5.6

Author: renovate-bot

example/package.json

@@ -6,7 +6,7 @@
   "dependencies": {
     "graphql-binding-github": "0.2.0",
     "graphql-import": "0.1.8",
-    "graphql-yoga": "0.4.7"
+    "graphql-yoga": "0.5.6"
   },
   "now": {
     "alias": "graphql-binding-github"

example/yarn.lock

@@ -548,9 +548,9 @@ graphql-tools@^2.14.0, graphql-tools@^2.14.1:
     deprecated-decorator "^0.1.6"
     uuid "^3.1.0"
 
-graphql-yoga@0.4.7:
-  version "0.4.7"
-  resolved "https://registry.yarnpkg.com/graphql-yoga/-/graphql-yoga-0.4.7.tgz#8ba2ef0c6229b52041b5d419f4b5da74bf6ded5d"
+graphql-yoga@0.5.6:
+  version "0.5.6"
+  resolved "https://registry.yarnpkg.com/graphql-yoga/-/graphql-yoga-0.5.6.tgz#f41e31491138d6b78afc6c1fddfdcd07543e0ac2"
   dependencies:
     "@types/cors" "^2.8.3"
     "@types/express" "^4.0.39"