Accept bytes alongside string as path argument in initiate_upgrade_connection

Thanks to @vxgmichel for pointing this out and the patch.

Author: pgjones

src/wsproto/__init__.py

@@ -4,7 +4,7 @@
 
 A WebSocket implementation.
 """
-from typing import Generator, Optional
+from typing import Generator, Optional, Union
 
 from .connection import Connection, ConnectionState, ConnectionType
 from .events import Event
@@ -40,7 +40,9 @@ def state(self) -> ConnectionState:
             return self.handshake.state
         return self.connection.state
 
-    def initiate_upgrade_connection(self, headers: Headers, path: str) -> None:
+    def initiate_upgrade_connection(
+        self, headers: Headers, path: Union[bytes, str]
+    ) -> None:
         self.handshake.initiate_upgrade_connection(headers, path)
 
     def send(self, event: Event) -> bytes:

src/wsproto/handshake.py

@@ -69,7 +69,9 @@ def connection(self) -> Optional[Connection]:
         """
         return self._connection
 
-    def initiate_upgrade_connection(self, headers: Headers, path: str) -> None:
+    def initiate_upgrade_connection(
+        self, headers: Headers, path: Union[bytes, str]
+    ) -> None:
         """Initiate an upgrade connection.
 
         This should be used if the request has already be received and