chore(deps): update dependency @types/graphql to v0.11.8

Author: renovate-bot

package.json

@@ -21,7 +21,7 @@
     "graphql-tools": "2.18.0"
   },
   "devDependencies": {
-    "@types/graphql": "0.11.7",
+    "@types/graphql": "0.11.8",
     "@types/node": "9.3.0",
     "typescript": "2.6.2"
   },

yarn.lock

@@ -6,6 +6,10 @@
   version "0.11.7"
   resolved "https://registry.yarnpkg.com/@types/graphql/-/graphql-0.11.7.tgz#da39a2f7c74e793e32e2bb7b3b68da1691532dd5"
 
+"@types/graphql@0.11.8":
+  version "0.11.8"
+  resolved "https://registry.yarnpkg.com/@types/graphql/-/graphql-0.11.8.tgz#53ff3604e99db810dd43347f19fcd1c59725a7bb"
+
 "@types/node@9.3.0":
   version "9.3.0"
   resolved "https://registry.yarnpkg.com/@types/node/-/node-9.3.0.tgz#3a129cda7c4e5df2409702626892cb4b96546dd5"