update doc and readme

README.md

@@ -15,6 +15,7 @@ If you use a plugin manager you can put the whole directory into your `~/.vim/bu
 You can change the color of indentLines:  
 for Vim, set `g:indentLine_color_term` in your `.vimrc`, e.g. `let g:indentLine_color_term = 239`,  
 for GVim, set `g:indentLine_color_gui` in your `.vimrc`, e.g. `let g:indentLine_color_gui = '#A4E57E'`
+for none X terminal, set `g:indentLine_color_tty` in your `.vimrc`, e.g. `let g:indentLine_color_tty = 2
 
 You can also change the indentLine char:  
 for both Vim and GVim, set `let g:indentLine_char = 'c'` where `'c'` can be any ASCII character. You can also use one of `¦`, `┆` or `│` to display more beautiful lines. However, these characters will only work with files whose encoding is UTF-8.

doc/indentLine.txt

@@ -46,6 +46,10 @@ g:indentLine_color_gui                          *g:indentLine_color_gui*
                 Specify GUI vim indent line color.
                 e.g.  let g:indentLine_color_gui = '#A4E57E'
 
+g:indentLine_color_tty                          *g:indentLine_color_tty*
+                Specify none X terminal vim indent line color. (0 - 7)
+                e.g.  let g:indentLine_color_tty = 2
+
 g:indentLine_indentLevel                        *g:indentLine_indentLevel*
                 Specify how much indent level do you want to use for
                 indentLine. Most program will not has bigger indent level than