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

Closes #56

Author: greenkeeper[bot]

package.json

@@ -54,7 +54,7 @@
     "rollup-plugin-filesize": "^6.2.1",
     "rollup-plugin-node-resolve": "^5.2.0",
     "rollup-plugin-typescript2": "^0.25.3",
-    "ts-jest": "^24.2.0",
+    "ts-jest": "^25.5.0",
     "ts-loader": "^6.2.1",
     "typescript": "^3.7.3"
   },