chore(package): update @types/jest to version 25.1.1

Closes #15

Author: greenkeeper[bot]

Diff for: package.json

@@ -31,7 +31,7 @@
   },
   "dependencies": {},
   "devDependencies": {
-    "@types/jest": "^24.0.0",
+    "@types/jest": "^25.1.1",
     "@types/node": "^10.12.10",
     "coveralls": "^3.0.2",
     "jest": "^23.6.0",