readme: update onyx/http version

Author: vladfaust

README.md

@@ -58,7 +58,7 @@ dependencies:
     version: ~> 0.4.0
   onyx-http:
     github: onyxframework/http
-    version: ~> 0.7.0
+    version: ~> 0.8.0
 ```
 
 ## Documentation 📚