update readme

README.md

@@ -63,9 +63,11 @@ var Leopard = require('leopard-template')
 Or you can also load with html `script` tag
 
 ``` html
-<script src="./node_modules/leopard-template/dist/leopard.min.js"></script>
+<script src="./node_modules/leopard-template/dist/leopard.browser.min.js"></script>
 ```
 
+> Note: `compileFile` is only available at server side, so we build two versions, if you want to use Leopard directly in browsers, use `leopard.browser.js`, otherwise you'll have to use `leopard.server.js`.
+
 ## Syntax
 
 Leopard simply implements ejs syntax.