chore(package): update ts-jest to version 24.0.1

Closes #8

Author: greenkeeper[bot]

Diff for: package.json

@@ -37,7 +37,7 @@
     "jest": "^23.6.0",
     "prettier": "^1.14.3",
     "rimraf": "^2.6.2",
-    "ts-jest": "^23.10.3",
+    "ts-jest": "^24.0.1",
     "ts-node": "^7.0.1",
     "tslint": "^5.11.0",
     "tslint-config-prettier": "^1.15.0",