upgrade.rbs in httpx-0.16.0

- old
+ new

@@ -5,19 +5,18 @@
 
       def self.configure: (singleton(Session)) -> void
 
       interface _UpgradeOptions
         def upgrade_handlers: () -> handlers_registry?
-        def upgrade_handlers=: (handlers_registry) -> handlers_registry
       end
- 
+
       def self.extra_options: (Options) -> (Options & _UpgradeOptions)
 
       module ConnectionMethods
         attr_reader upgrade_protocol: Symbol?
         attr_reader hijacked: boolish
 
         def hijack_io: () -> void
       end
-    end      
+    end
   end
 end