chore(package): update ts-jest to version 25.5.0

Closes #27

Author: greenkeeper[bot]

package.json

@@ -68,7 +68,7 @@
     "rollup-plugin-includepaths": "^0.2.3",
     "rollup-plugin-node-resolve": "^5.2.0",
     "rollup-plugin-uglify": "^6.0.3",
-    "ts-jest": "^24.1.0",
+    "ts-jest": "^25.5.0",
     "tslint": "^5.20.0",
     "typescript": "^3.6.3"
   },