Merge pull request #8 from Dapperware/greenkeeper/@types/jest-23.3.8

chore(package): update @types/jest to version 23.3.8

Author: paulpdaniels

package.json

@@ -39,7 +39,7 @@
     "rxjs": "^6.2.2"
   },
   "devDependencies": {
-    "@types/jest": "^23.3.1",
+    "@types/jest": "^23.3.8",
     "chai": "^4.1.2",
     "jest": "^23.5.0",
     "jest-fetch-mock": "^1.6.5",