dont yield dirs

cmd/config.go

@@ -79,7 +79,13 @@ func (config config) targets() ([]string, error) {
 		if err != nil {
 			return nil, err
 		}
-		result = append(result, results...)
+		for i := range results {
+			if stat, err := os.Stat(results[i]); err != nil {
+				return nil, err
+			} else if !stat.IsDir() {
+				result = append(result, results[i])
+			}
+		}
 	}
 
 	if len(result) == 0 {