Update dependency graphql-yoga to v1.2.1

Author: renovate-bot

basic/server/package.json

@@ -6,7 +6,7 @@
   },
   "dependencies": {
     "graphcool-binding": "1.3.5",
-    "graphql-yoga": "1.2.0"
+    "graphql-yoga": "1.2.1"
   },
   "devDependencies": {
     "now": "8.5.4"

basic/server/yarn.lock

@@ -473,15 +473,14 @@ graphql-tools@2.18.0, graphql-tools@^2.18.0:
     graphql-subscriptions "^0.5.6"
     uuid "^3.1.0"
 
-graphql-yoga@1.2.0:
-  version "1.2.0"
-  resolved "https://registry.yarnpkg.com/graphql-yoga/-/graphql-yoga-1.2.0.tgz#3c2aa3a77a20792f208ea63ec92ec1a5360b1d1d"
+graphql-yoga@1.2.1:
+  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"