chore(deps): update dependency @types/graphql to v0.12.4

Author: renovate-bot

package.json

@@ -21,7 +21,7 @@
     "graphql-tools": "2.21.0"
   },
   "devDependencies": {
-    "@types/graphql": "0.12.3",
+    "@types/graphql": "0.12.4",
     "@types/node": "9.4.6",
     "typescript": "2.7.1"
   },

yarn.lock

@@ -2,9 +2,9 @@
 # yarn lockfile v1
 
 
-"@types/graphql@0.12.3":
-  version "0.12.3"
-  resolved "https://registry.yarnpkg.com/@types/graphql/-/graphql-0.12.3.tgz#c429585aaa4523135e0ab4e12dec72d2d913946f"
+"@types/graphql@0.12.4":
+  version "0.12.4"
+  resolved "https://registry.yarnpkg.com/@types/graphql/-/graphql-0.12.4.tgz#d43bb55d45c6de0178bbd11dd59d04fd42138d94"
 
 "@types/node@9.4.6":
   version "9.4.6"