chore(package): update husky to version 4.0.6

Closes #37

Author: greenkeeper[bot]

package.json

@@ -45,7 +45,7 @@
     "coveralls": "^3.0.2",
     "eslint": "^5.14.0",
     "eslint-config-prettier": "^6.1.0",
-    "husky": "^2.0.0",
+    "husky": "^4.0.6",
     "lint-staged": "^9.0.0",
     "nyc": "^15.0.0",
     "prettier": "^1.16.4"