use full url for url to demo

README.md

@@ -4,7 +4,7 @@ A flipper zero NTAG215 writer
 
 
 <p align="center">
-  <video src="demo.mp4" width="720px"></video>
+  <video src="https://raw.githubusercontent.com/bettse/weebo/main/demo.mp4" width="720px"></video>
 </p>
 
 ## Todo