fix(deps): update graphql-yoga to v1.2.0

Author: renovate[bot]

basic/server/package.json

@@ -6,7 +6,7 @@
   },
   "dependencies": {
     "graphcool-binding": "1.3.5",
-    "graphql-yoga": "1.1.7"
+    "graphql-yoga": "1.2.0"
   },
   "devDependencies": {
     "now": "9.1.0"