Update README with the new option

Author: guiniol

README.md

@@ -19,6 +19,11 @@ If you prefer the scheme to match the original monokai background color, put thi
 let g:molokai_original = 1
 ```
 
+If you prefer a transparent background for the terminal version, put this in your .vimrc file:
+```
+let g:molokai_transparent = 1
+```
+
 There is also an alternative scheme under development for color terminals which attempts to bring the 256 color version as close as possible to the the default (dark) GUI version. To access, add this to your .vimrc:
 ```
 let g:rehash256 = 1