Update README.md

Author: buffrr

README.md

@@ -6,7 +6,7 @@
    </p>
 </p>
 
-<img src="screenshot.png">
+<img src="https://github.com/spacesprotocol/subs/blob/main/screenshot.png?raw=true">
 
 ## How it works
 
@@ -88,4 +88,4 @@ subs --test-rig --test-rig-dir ./testrig-data
 
 ## License
 
-Apache 2.0
+Apache 2.0