fix(deps): update dependency graphql-tools to v2.20.0

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": "2.19.0"
+    "graphql-tools": "2.20.0"
   },
   "devDependencies": {
     "@types/graphql": "0.12.3",

yarn.lock

@@ -78,14 +78,13 @@ [email protected]:
     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"
+graphql-tools@2.20.0:
+  version "2.20.0"
+  resolved "https://registry.yarnpkg.com/graphql-tools/-/graphql-tools-2.20.0.tgz#4fa7b0c403115a0b636f685263c6faec5f219a24"
   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"
 
 [email protected]: