Update readme

Author: tangbc

README.md

@@ -51,9 +51,9 @@ https://tangbc.github.io/vue-virtual-scroll-list
 
 ## What's new in v2.0
 
-Here are the details of update information [release v2.0]().
+Here are the details of update information [release v2.0](https://github.com/tangbc/vue-virtual-scroll-list/releases/tag/v2.0.0).
 
-Since the `v2.0` is **not compatible** with `v1.x`, please note before upgrading, `v1.x` documentation see [v1.x.md]().
+Since the `v2.0` is **not compatible** with `v1.x`, please note before upgrading, `v1.x` documentation see [v1.x.md](https://github.com/tangbc/vue-virtual-scroll-list/blob/master/v1.x.md).
 
 
 ## Simple usage

v1.x.md

@@ -1,4 +1,6 @@
-# documentation for 1.x
+# v1.x
+
+> this is documentation for old version `v1.x`, not compatible with `v2.0`, any problem and features please propose on lastest version.
 
 ## Simple usage
 
@@ -89,7 +91,7 @@ If you assign `variable` as `true`, **do not** set inline style height inside `<
 </template>
 ```
 
-**More use ways or getting start you can refer to these clearly [demos](https://github.com/tangbc/vue-virtual-scroll-list/tree/master/demos) or [test suites](https://github.com/tangbc/vue-virtual-scroll-list/tree/master/test).**
+**More use ways or getting start you can refer to these clearly [demos](https://github.com/tangbc/vue-virtual-scroll-list/tree/v1.4.7/demos) or [test suites](https://github.com/tangbc/vue-virtual-scroll-list/tree/v1.4.7/test).**
 
 
 ## Performance comparison