Fix the heading level in README.md (#257)

superbrothers · web-flow · commit c2290b44ed5f · 2023-04-13T13:17:04.000+09:00
diff --git a/README.md b/README.md
@@ -110,7 +110,7 @@ Stern will use the `$KUBECONFIG` environment variable if set. If both the
 environment variable and `--kubeconfig` flag are passed the cli flag will be
 used.
 
-## config file
+### config file
 
 You can use the config file to change the default values of stern options. The default config file path is `~/.config/stern/config.yaml`. 
 
