chore(package): update @types/jest to version 23.3.4

Closes #3

Author: greenkeeper[bot]

package.json

@@ -14,7 +14,7 @@
     "prepack": "tsc"
   },
   "devDependencies": {
-    "@types/jest": "^22.2.2",
+    "@types/jest": "^23.3.4",
     "@types/node": "^10.0.3",
     "jest": "^22.4.3",
     "standard-version": "^4.3.0",