fix demo link

gy2006 · gy2006 · commit 2354d5168bc8 · 2020-07-29T16:31:49.000+02:00
diff --git a/README.md b/README.md
@@ -31,4 +31,4 @@ cd flow-docker
 ./server.sh start
 ```
 
-![](./src/demo.gif)
+![demo](https://github.com/FlowCI/docs/raw/master/src/demo.gif)
