breaking changes: waline 適配 V2

breaking changes: waline 的 visitor 改為 pageview
feat: algolia 搜索增加文章內容顯示和高亮
feat: 搜索內容顯示區域變大

package.json

@@ -1,6 +1,6 @@
 {
   "name": "hexo-theme-butterfly",
-  "version": "4.2.0-b2",
+  "version": "4.2.0",
   "description": "A Simple and Card UI Design theme for Hexo",
   "main": "package.json",
   "scripts": {