update vim8 async part of readme

Author: devjoe

README.md

@@ -40,7 +40,7 @@ This Vim plugin is built on top of the great tool [CodeQuery](https://github.com
 
 <br>
 
-## Demo 
+## Demo
 
 `Choose a query from menu ➙ Get results`  
 
@@ -52,30 +52,32 @@ This Vim plugin is built on top of the great tool [CodeQuery](https://github.com
 
 [more demo and screenshots](https://github.com/devjoe/vim-codequery/wiki/Screenshots-and-Demo)
 
+> These videos are quite old.
+> Now vim-codequery works better than what you see. (by supporting Vim8's async feature)
 <br>
   
 ## Schedule
 
 > **This project is almost ready to be released.**   
 >  
 > Main TODO:
-> * Use Vim8's new features to enhance usability.
+> * ~~Use Vim8's new features to enhance usability.~~
 > * ~~Do lazy-loading.~~
 > * Test it.
 > * Doc it.
 >  
 > Completeness: 92%  
 > Current Version: v0.8
 >  
-> It is Ok to try it! 👌  
+> Welcome to try it! 👌  
   
 <br>
 
 ## Installation
 
 #### 1. Make sure these commands are in your system
 <pre>
-echo mkdir mv cut find awk stat git(optional)
+/bin/sh echo mkdir mv cut find awk stat git(optional)
 </pre>
 
 #### 2. Install CodeQuery