fix(package): update @gramps/gramps to version 3.1.0

Closes #63

Author: greenkeeper[bot]

package.json

@@ -30,7 +30,7 @@
     "semantic-release": "semantic-release"
   },
   "dependencies": {
-    "@gramps/gramps": "^1.0.0",
+    "@gramps/gramps": "^3.1.0",
     "apollo-server-express": "^1.3.2",
     "babel-core": "^6.26.0",
     "body-parser": "^1.18.2",