chore(package): update dependencies

Author: greenkeeper[bot]

package.json

@@ -32,7 +32,7 @@
     "babel-polyfill": "^6.7.4",
     "babel-preset-es2015": "^6.6.0",
     "babel-preset-stage-0": "^6.5.0",
-    "bookshelf": "^0.11.1",
+    "bookshelf": "^0.12.0",
     "co": "^4.6.0",
     "graphql": "^0.11.0",
     "graphql-relay": "^0.5.1",