Center it.

jcs090218 · jcs090218 · commit 711fac0f227b · 2020-11-16T14:09:43.000+08:00
diff --git a/README.md b/README.md
@@ -127,7 +127,9 @@ document style. Let's try apply to language `TypeScript` only within
 (add-hook 'typescript-mode-hook #'my-typescript-mode-hook)
 ```
 
-<img src="./etc/typescript/ts-doc-demo.gif"/>
+<p align="center">
+  <img src="./etc/typescript/ts-doc-demo.gif"/>
+</p>
 
 ## Advance Implementation
 
