Update dependency graphql-yoga to v1.8.0

Author: renovate-bot

basic/server/package.json

@@ -6,7 +6,7 @@
   },
   "dependencies": {
     "graphcool-binding": "1.3.5",
-    "graphql-yoga": "1.7.1"
+    "graphql-yoga": "1.8.0"
   },
   "devDependencies": {
     "now": "8.5.4"

basic/server/yarn.lock

@@ -569,9 +569,9 @@ graphql-tools@^2.23.1:
     iterall "^1.1.3"
     uuid "^3.1.0"
 
-graphql-yoga@1.7.1:
-  version "1.7.1"
-  resolved "https://registry.yarnpkg.com/graphql-yoga/-/graphql-yoga-1.7.1.tgz#64034932d39898b071e6104932e69615ed1daf93"
+graphql-yoga@1.8.0:
+  version "1.8.0"
+  resolved "https://registry.yarnpkg.com/graphql-yoga/-/graphql-yoga-1.8.0.tgz#53128012363736775dc94cc8dae78bdac9b6a620"
   dependencies:
     "@types/cors" "^2.8.3"
     "@types/express" "^4.11.1"