build(changelog): Use standard-changelog and add task

package.json

@@ -1,10 +1,11 @@
 {
   "name": "docbox",
-  "version": "1.0.4",
+  "version": "1.0.5",
   "description": "an api documentation website",
   "main": "index.js",
   "scripts": {
     "start": "budo src/index.js --serve=bundle.js --live",
+    "changelog": "standard-changelog -w CHANGELOG.md",
     "test": "npm run test-unit && eslint src && npm run prerender -- /dev/null && rm -rf lib",
     "test-unit": "mocha --compilers js:babel-register test",
     "prerender": "babel src --out-dir lib && node lib/render.js",
@@ -49,6 +50,7 @@
     "remark": "^7.0.0",
     "remark-html": "^6.0.0",
     "remark-slug": "^4.1.0",
+    "standard-changelog": "^1.0.1",
     "standard-version": "^4.0.0",
     "unist-util-select": "^1.3.0",
     "unist-util-visit": "^1.0.0"