Merge pull request #9 from honkjs/greenkeeper/ts-jest-25.1.0

Update ts-jest to the latest version 🚀

Author: decoy

package.json

@@ -31,7 +31,7 @@
     "@types/jest": "^24.0.15",
     "jest": "^24.8.0",
     "np": "^4.0.2",
-    "ts-jest": "^24.0.2",
+    "ts-jest": "^25.1.0",
     "typescript": "^3.5.3"
   },
   "publishConfig": {