Merge pull request #20 from terrestris/greenkeeper/ts-jest-24.0.0

Update ts-jest to the latest version 🚀

Author: dnlkoch

package.json

@@ -48,7 +48,7 @@
     "coveralls": "3.0.3",
     "jest": "23.6.0",
     "np": "4.0.2",
-    "ts-jest": "23.10.5",
+    "ts-jest": "24.0.0",
     "tslint": "5.12.1",
     "typescript": "3.2.4",
     "uglifyjs-webpack-plugin": "2.1.1",