chore(readme): update

Author: 2nthony

README.md

@@ -18,7 +18,7 @@ Please consider starring the project to show your ❤️ and support.
 
 <p align="center">
   <!-- <img width="600" src="https://user-images.githubusercontent.com/19513289/59367597-0538b700-8d6f-11e9-9633-dc867789e36d.png"> -->
-  <img src="./git-delete-branch.svg">
+  <img width="600" src="./git-delete-branch.svg">
 </p>
 
 <!-- ![](./git-delete-branch.svg) -->