Update README.

Show Lint result on saving .go files.

Fixes #10.

Signed-off-by: David Symonds <dsymonds@golang.org>
diff --git a/README b/README
index a2cac54..e9fffab 100644
--- a/README
+++ b/README
@@ -30,3 +30,6 @@
   exe "set rtp+=" . globpath($GOPATH, "src/github.com/golang/lint/misc/vim")
 
 Running :Lint will run golint on the current file and populate the quickfix list.
+
+Optionally, add this to your ~/.vimrc to automatically run golint on :w
+  autocmd BufWritePost,FileWritePost *.go execute 'Lint' | cwindow