chore(package): update ts-jest to version 25.1.0 (#140)

Author: greenkeeper[bot]

package.json

@@ -45,7 +45,7 @@
     "remark-cli": "^7.0.0",
     "remark-lint": "^6.0.4",
     "remark-preset-lint-recommended": "^3.0.2",
-    "ts-jest": "^24.0.0",
+    "ts-jest": "^25.1.0",
     "tslint": "^5.14.0",
     "typescript": "^3.4.5"
   },