Update README.md

Author: mritd

README.md

@@ -1,9 +1,9 @@
 ## Dockerfile
 
-### ⚠️⚠️⚠️ Note: Some build work of docker image is being migrated to earthly, 
-### you may not see the update commit in the current repo.
-### Earthlyfile has better scalability and is more convenient for cross-compilation; 
-### the migrated dockerfle can be viewed in [https://github.com/mritd/autobuild](https://github.com/mritd/autobuild).
+### ⚠️⚠️⚠️ Note: Some build work of docker image is being migrated to earthly, you may not see the update commit in the current repo.
+### ⚠️⚠️⚠️ Earthlyfile has better scalability and is more convenient for cross-compilation; the migrated dockerfle can be viewed in [https://github.com/mritd/autobuild](https://github.com/mritd/autobuild).
+
+---
 
 This repository contains some dockerfiles of personally created docker images;
 it will be maintained for long periods if necessary.