Fix #133: escape backslash

Author: tungel

plugin/vimux.vim

@@ -53,7 +53,7 @@ function! VimuxRunCommand(command, ...)
 endfunction
 
 function! VimuxSendText(text)
-  call VimuxSendKeys('"'.escape(a:text, '"$').'"')
+  call VimuxSendKeys('"'.escape(a:text, '\"$').'"')
 endfunction
 
 function! VimuxSendKeys(keys)