chore(add husky): add standard and commitlint

package.json

@@ -4,6 +4,8 @@
   "description": "A vue component for tree structure. Support adding treenode/leafnode, editing node's name and dragging.",
   "main": "dist/vue-tree-list.min.js",
   "scripts": {
+    "commit": "npx git-cz",
+    "standard": "standard",
     "test": "karma start --single-run",
     "unit": "karma start --watch",
     "coveralls": "npm run test -- --report lcovonly && cat ./coverage/lcov.info | coveralls",
@@ -26,6 +28,8 @@
   },
   "homepage": "https://github.com/ParadeTo/vue-tree-list#readme",
   "devDependencies": {
+    "@commitlint/cli": "^7.2.1",
+    "@commitlint/config-conventional": "^7.1.2",
     "autoprefixer": "^6.4.0",
     "babel-core": "^6.0.0",
     "babel-eslint": "^7.0.0",
@@ -39,6 +43,8 @@
     "cross-env": "^5.0.1",
     "css-loader": "^0.26.2",
     "file-loader": "^0.10.1",
+    "html-webpack-plugin": "^2.8.1",
+    "husky": "^1.2.0",
     "isparta": "^4.0.0",
     "isparta-loader": "^2.0.0",
     "less": "^2.7.2",
@@ -46,6 +52,7 @@
     "sinon": "^2.3.5",
     "sinon-chai": "^2.11.0",
     "sourcemap": "^0.1.0",
+    "standard": "^12.0.1",
     "url-loader": "^0.5.7",
     "vue": "^2.3.4",
     "vue-loader": "^11.1.3",
@@ -53,7 +60,9 @@
     "vue-template-compiler": "^2.2.0",
     "webpack": "^1.13.2",
     "webpack-dev-server": "1.14.0",
-    "webpack-merge": "^0.14.1",
-    "html-webpack-plugin": "^2.8.1"
+    "webpack-merge": "^0.14.1"
+  },
+  "dependencies": {
+    "cz-conventional-changelog": "^2.1.0"
   }
 }