update README

Author: tzfun

README.md

@@ -2,7 +2,7 @@
 
 # vue-web-terminal
 
-<a href="https://github.com/tzfun/vue-web-terminal"><img src="https://shields.io/github/package-json/v/tzfun/vue-web-terminal/master"></a>
+<a href="https://github.com/tzfun/vue-web-terminal/tree/vue2"><img src="https://shields.io/github/package-json/v/tzfun/vue-web-terminal/vue2"></a>
 <a href="https://github.com/tzfun/vue-web-terminal/tree/vue3"><img src="https://shields.io/github/package-json/v/tzfun/vue-web-terminal/vue3"></a>
 <a href="https://www.npmjs.com/package/vue-web-terminal"><img src="https://shields.io/bundlephobia/minzip/vue-web-terminal"></a>
 <a href="https://npmcharts.com/compare/vue-web-terminal?minimal=true"><img src="https://img.shields.io/npm/dt/vue-web-terminal.svg" alt="Downloads"></a>