Remove test warning due to v1.2.4 fix

Author: EvanQuan

README.md

@@ -3,8 +3,6 @@
 This plugin allows you to easily execute files in the terminal or a separate
 buffer.
 
-**Note: This has not currently been tested for Vim 7 or earlier. Progress is being made for backwards compatibility.**
-
 ![](https://raw.githubusercontent.com/wiki/EvanQuan/vim-executioner/executioner.PNG)
 
 Table of Contents