Update jest

Seems to fix fsevents error for latest node

Author: simonihmig

package.json

@@ -18,7 +18,7 @@
     "codemod-cli": "^0.2.5"
   },
   "devDependencies": {
-    "jest": "^23.1.0"
+    "jest": "^23.6.0"
   },
   "engines": {
     "node": ">= 6"