missing sig for HTTP2 Connection

sig/connection/http2.rbs

@@ -8,6 +8,7 @@ module HTTPX
     attr_reader streams: Hash[Request, ::HTTP2::Stream]
     attr_reader pending: Array[Request]
 
+    @connection: HTTP2::Client
     @options: Options
     @settings: Hash[Symbol, Integer | bool]
     @max_concurrent_requests: Integer

sig/pool.rbs

@@ -5,6 +5,8 @@ module HTTPX
   }
 
   class Pool
+    POOL_TIMEOUT: Integer
+
     type resolver_manager = Resolver::Multi | Resolver::System
 
     @max_connections_per_origin: Integer