fix(deps): update dependency graphql-tools to v2.19.0

Author: renovate-bot

package.json

@@ -18,7 +18,7 @@
     "cross-fetch": "1.1.1",
     "graphql": "0.12.3",
     "graphql-binding": "1.2.0",
-    "graphql-tools": "2.18.0"
+    "graphql-tools": "2.19.0"
   },
   "devDependencies": {
     "@types/graphql": "0.12.1",

yarn.lock

@@ -78,6 +78,16 @@ graphql-tools@2.18.0:
     graphql-subscriptions "^0.5.6"
     uuid "^3.1.0"
 
+graphql-tools@2.19.0:
+  version "2.19.0"
+  resolved "https://registry.yarnpkg.com/graphql-tools/-/graphql-tools-2.19.0.tgz#04e1065532ab877aff3ad1883530fb56804ce9bf"
+  dependencies:
+    apollo-link "^1.0.0"
+    apollo-utilities "^1.0.1"
+    deprecated-decorator "^0.1.6"
+    graphql-subscriptions "^0.5.6"
+    uuid "^3.1.0"
+
 graphql@0.12.3:
   version "0.12.3"
   resolved "https://registry.yarnpkg.com/graphql/-/graphql-0.12.3.tgz#11668458bbe28261c0dcb6e265f515ba79f6ce07"