fixes #37 and provides statusline configuration

configure statusline with
```vim
let g:nord_statusline_uniform = 1
```
default is to use brighter background (`0`), but easily configurable
with by setting `g:nord_statusline_uniform` to `1`)

NOTE: this does not work with airline or lightline

1 files changed, 14 insertions, 0 deletions

diff --git a/README.md b/README.md
index 7c74a8e..45cd795 100644
--- a/README.md
+++ b/README.md
@@ -114,6 +114,20 @@ It can be enabled by setting the `g:nord_italic_comments` variable to `1`.
 let g:nord_italic_comments = 1
 ```
 
+### Uniform StatusLine Backgrund
+
+Allow StatusLine backgrounds to be uniform.
+
+By default, Nord uses a slightly brighter background for the current split buffer.
+This is designed to draw attention to the currently active buffer without being
+distracting.
+
+However, if the user desires the backgrounds to be a uniform color,
+`g:nord_statusline_uniform` can be set to `1` as follows:
+```vim
+let g:nord_statusline_uniform = 1
+```
+
 ## Plugin Support
 Nord Vim provides support for many third-party language- and the UI plugins.