Update README.md

Author: hackape

README.md

@@ -1,7 +1,7 @@
 Detect the Vimium Chrome extension
 ==================================
 
-Detect whether the [Vimium Chrome extension](http://vimium.github.io/) is installed. Tested on Vimium __v1.59__.
+Detect whether the [Vimium Chrome extension](http://vimium.github.io/) is installed. Tested on Vimium __v1.59__. As for an official solution to Vimium detection, keep an eye on [Vimium issue#2399](https://github.com/philc/vimium/issues/2399)
 
 `hasVimium` returns true if Vimium is detected, false otherwise. This detection is not 100% accurate.