Updated the README with the new -i arg

README.md

@@ -1,6 +1,6 @@
 # git-heatmap
 
-simple but customizable heatmap for your local git repos written in Rust.
+simple but customizable heatmap for your **local** git repos written in Rust.
 
 ![screenshot](screenshot.png)
 
@@ -47,6 +47,9 @@ $ git-heatmap -r "/path/to/repo" -b "main" -r "other/repo" -b ""
 # which branches should be checked per repo, in this case all branches will be checked.
 $ git-heatmap --root-dir "/path"
 
+# when using the --root-dir option you can also ignore folders of repos you don't want to count
+$ git-heatmap --root-dir "/path" -i "project"
+
 # by default merges are counted so using --no-merges ensures they won't be counted
 $ git-heatmap --no-merges