chore(deps): update dependency graphql-yoga to v1.2.1

Author: renovate-bot

example/package.json

@@ -5,7 +5,7 @@
   },
   "dependencies": {
     "graphql-binding-github": "0.3.1",
-    "graphql-yoga": "1.2.0"
+    "graphql-yoga": "1.2.1"
   },
   "now": {
     "alias": "graphql-binding-github"

example/yarn.lock

@@ -450,15 +450,14 @@ [email protected]:
     graphql-subscriptions "^0.5.6"
     uuid "^3.1.0"
 
-[email protected].0:
-  version "1.2.0"
-  resolved "https://registry.yarnpkg.com/graphql-yoga/-/graphql-yoga-1.2.0.tgz#3c2aa3a77a20792f208ea63ec92ec1a5360b1d1d"
+[email protected].1:
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/graphql-yoga/-/graphql-yoga-1.2.1.tgz#145ec6521aa5d2c7e2a03e269d52d7670060efac"
   dependencies:
     "@types/cors" "^2.8.3"
     "@types/express" "^4.0.39"
     "@types/graphql" "^0.11.8"
     "@types/zen-observable" "^0.5.3"
-    apollo-link "^1.0.7"
     apollo-server-express "^1.3.2"
     apollo-server-lambda "1.3.2"
     apollo-upload-server "^4.0.0-alpha.1"