docs: Update readme

Author: fwh1990

snapshots/README.md

@@ -1,23 +1,6 @@
 ## 说明
 目录里的内容都是用工具自动生成的。
 
-----------
-
-The icons in folders are all generated by cli command automatically.
-
---------
-
 ```bash
-cp -f ./scripts/config/all-in-one-js.json ./iconfont.json
-npx ts-node src/index.ts
-
-cp -f ./scripts/config/all-in-one-ts.json ./iconfont.json
-npx ts-node src/index.ts
-
-cp -f ./scripts/config/depends-on-js.json ./iconfont.json
-npx ts-node src/index.ts
-
-cp -f ./scripts/config/depends-on-ts.json ./iconfont.json
-npx ts-node src/index.ts
-
+sh scripts/update-snapshot.sh
 ```