Update readme.

Author: ghosind

README-CN.md

@@ -10,6 +10,8 @@
 
 DVM是一个强大的轻量级[Deno](https://deno.land/)版本管理工具，可在MacOS、Linux、WSL以及装有Bash的Windows上使用。
 
+DVM仅在v0.7.0及之后的版本支持Windows。对于Windows用户，使用DVM前需要安装Bash Shell。例如，可以在安装WSL后在PowerShell中执行`bash`命令。
+
 ***在使用DVM管理你的多版本环境时，请避免使用`deno upgrade`命令进行升级deno版本。***
 
 - [安装与升级](#安装与升级)

README.md

@@ -10,7 +10,9 @@ English | [简体中文](./README-CN.md)
 
 Dvm is a lightweight, and powerful [Deno](https://deno.land/) version manager for MacOS, Linux, WSL, and Windows with Bash.
 
-***Please avoid use `deno upgrade` command to upgrade Deno when you're using DVM to manage your multiple version environment.***
+For Windows users, you must install DVM v0.7.0 or later versions, and also need to install a bash shell if you want to use this tool. For example, you can install WSL and execute `bash` command in PowerShell.
+
+***Please do not use `deno upgrade` command to upgrade Deno after you had installed Deno with DVM.***
 
 - [Installing and Updating](#installing-and-updating)
    - [Installation](#installation)