fix(package): update graphql-tools to version 2.7.2

Closes #22

Author: greenkeeper[bot]

package.json

@@ -51,7 +51,7 @@
     "dataloader": "^1.3.0",
     "graphql": "^0.11.3",
     "graphql-server-micro": "^1.1.0",
-    "graphql-tools": "^1.2.2",
+    "graphql-tools": "^2.7.2",
     "micro": "^9.0.0",
     "micro-compress": "^1.0.0",
     "micro-cors": "^0.0.4",