chore(package): update ts-jest to version 24.0.2

Closes #13

Author: greenkeeper[bot]

package.json

@@ -73,7 +73,7 @@
     "prettier": "^1",
     "rimraf": "^2",
     "semantic-release": "^15",
-    "ts-jest": "^23",
+    "ts-jest": "^24.0.2",
     "tslint": "^5",
     "tslint-config-prettier": "^1",
     "tslint-eslint-rules": "^5",