chore(package): update @types/jest to version 25.1.2

Closes #64

Author: greenkeeper[bot]

package.json

@@ -41,7 +41,7 @@
     "webpack-merge": "^4.2.1"
   },
   "devDependencies": {
-    "@types/jest": "^24.0.13",
+    "@types/jest": "^25.1.2",
     "@types/memory-fs": "^0.3.2",
     "@types/mini-css-extract-plugin": "^0.2.0",
     "@types/node": "^12.0.2",