chore: uninstall commit message helper

it's more annoying than helpful.

Author: gruhn

package.json

@@ -31,8 +31,7 @@
   "homepage": "https://gruhn.github.io/vue-qrcode-reader",
   "husky": {
     "hooks": {
-      "pre-commit": "lint-staged",
-      "prepare-commit-msg": "exec < /dev/tty && git cz --hook"
+      "pre-commit": "lint-staged"
     }
   },
   "lint-staged": {
@@ -49,7 +48,6 @@
     "babel-plugin-transform-runtime": "^6.23.0",
     "babel-preset-es2015": "^6.14.0",
     "babel-preset-stage-0": "^6.16.0",
-    "commitizen": "^3.1.1",
     "cross-env": "^3.1.3",
     "cross-spawn": "^5.0.1",
     "css-loader": "^0.26.1",