chore(package): update @types/jest to version 25.2.2

Closes #10

Author: greenkeeper[bot]

package.json

@@ -25,7 +25,7 @@
     "micro": "^9.3.2"
   },
   "devDependencies": {
-    "@types/jest": "^23.1.3",
+    "@types/jest": "^25.2.2",
     "@types/micro": "^7.3.1",
     "@types/node": "^10.3.6",
     "husky": "^0.14.3",