Use binary literal instead of hex literal for alignment with PROTOCOL.md

Author: blast-hardcheese

src/replit_river/rpc.py

@@ -47,8 +47,8 @@
 GenericRpcHandlerBuilder = Callable[
     [str, Channel[Any], Channel[Any]], Coroutine[None, None, None]
 ]
-ACK_BIT = 0x0001
-STREAM_OPEN_BIT = 0x0002
+ACK_BIT = 0b00001
+STREAM_OPEN_BIT = 0b00010
 
 # these codes are retriable
 # if the server sends a response with one of these codes,