chore(package): update ts-jest to version 25.3.0

Closes #17

Author: greenkeeper[bot]

package.json

@@ -45,7 +45,7 @@
     "concurrently": "^4.1.0",
     "http-server": "^0.11.1",
     "jest": "^24.1.0",
-    "ts-jest": "^24.0.0",
+    "ts-jest": "^25.3.0",
     "tslint": "^5.9.1",
     "tslint-config-micro-tools": "^0.1.0",
     "typescript": "^3.3.3"