fix(package): update jest to version 21.0.2

Closes #34

Author: greenkeeper[bot]

package.json

@@ -45,7 +45,7 @@
   },
   "dependencies": {
     "inflection": "^1.12.0",
-    "jest": "^20.0.4",
+    "jest": "^21.0.2",
     "knex": "^0.13.0",
     "pg": "^7.1.2"
   },