chore(package): update ts-jest to version 25.1.0

Closes #9

Author: greenkeeper[bot]

package.json

@@ -96,7 +96,7 @@
     "rollup-plugin-sourcemaps": "^0.4.2",
     "rollup-plugin-typescript2": "^0.19.0",
     "semantic-release": "^15.12.0",
-    "ts-jest": "^23.10.2",
+    "ts-jest": "^25.1.0",
     "ts-node": "^7.0.1",
     "tslint": "^5.11.0",
     "tslint-config-prettier": "^1.15.0",