Upgrade jest to 23.6

Author: bethanyaconnor

package.json

@@ -72,7 +72,7 @@
     "file-loader": "^4.2.0",
     "idempotent-babel-polyfill": "6.26.0-1",
     "identity-obj-proxy": "^3.0.0",
-    "jest": "^15.0.0",
+    "jest": "^23.6.0",
     "jquery": "1.12.1",
     "lodash": "^4.17.5",
     "mem": ">=4.0.0",