chore(package): update husky to version 4.2.0

Closes #20

Author: greenkeeper[bot]

package.json

@@ -33,7 +33,7 @@
     "eslint": "^5.8.0",
     "eslint-config-egg": "^7.1.0",
     "eslint-plugin-jest": "^22.0.0",
-    "husky": "^3.0.0",
+    "husky": "^4.2.0",
     "jest": "^23.6.0"
   }
 }