message: update readme for status bar color changing
diff: @@ -12,6 +12,7 @@ VSCodeVim is a [Visual Studio Code](https://code.visualstudio.com/) extension th
  * The [EasyMotion plugin](#how-to-use-easymotion)
  * The [Surround.vim plugin](#how-to-use-surround)
  * The [Commentary plugin](#how-to-use-commentary)
  +* The [Vim-airline plugin](#statusBarColorControl)
  * And much more! Refer to the [roadmap](ROADMAP.md) or everything we support.
  Please [report missing features/bugs on GitHub](https://github.com/VSCodeVim/Vim/issues), which will help us get to them faster.
  @@ -213,6 +214,25 @@ Or bind ctrl+n to turn off search highlighting and `<leader>w` to save the curre
  * Use a non-blinking block cursor
  * Type: Boolean (Default: `false`)
  +
  +#### statusBarColorControl
  + * Control status bar color based on current mode
  + * Type: Boolean (Default: `false`)
  +
  + Once this is set, you need to set statusBarColors as well with these exact strings for modenames. The colors can be adjusted to suit the user.
  +
  +```
  + "vim.statusBarColorControl": true,
  + "vim.statusBarColors" : {
  + "normal": "#005f5f",
  + "insert": "#5f0000",
  + "visual": "#5f00af",
  + "visualline": "#005f87",
  + "visualblock": "#86592d",
  + "replace": "#000000"
  + }
  +```
  +
  ### Vim settings we support
  #### ignorecase
  