chore(package): update ts-jest to version 25.4.0

Closes #63

Author: greenkeeper[bot]

package.json

@@ -34,7 +34,7 @@
     "jest": "^24.8.0",
     "react": "^16.8.0",
     "react-dom": "^16.8.0",
-    "ts-jest": "^24.0.2",
+    "ts-jest": "^25.4.0",
     "typescript": "^3.5.3"
   },
   "peerDependencies": {