Fixes an issue with chart_depth when charts_dir is . (#83)

Signed-off-by: chrisbsmith <chris.b.smith@gmail.com>

cr.sh

@@ -225,7 +225,7 @@ lookup_changed_charts() {
     local changed_files
     changed_files=$(git diff --find-renames --name-only "$commit" -- "$charts_dir")
 
-    local depth=$(( $(tr "/" "\n" <<< "$charts_dir" | wc -l) + 1 ))
+    local depth=$(( $(tr "/" "\n" <<< "$charts_dir" | sed '/^\(\.\)*$/d' | wc -l) + 1 ))
     local fields="1-${depth}"
 
     cut -d '/' -f "$fields" <<< "$changed_files" | uniq | filter_charts