emit and set the keep alive timeout to the channel, now that channels do their own accounting

lib/httpx/channel.rb

@@ -297,6 +297,9 @@ module HTTPX
           transition(:open)
         end
       end
+      parser.on(:timeout) do |timeout|
+        @timeout = timeout
+      end
       parser.on(:error) do |request, ex|
         case ex
         when MisdirectedRequestError

lib/httpx/channel/http1.rb

@@ -162,7 +162,10 @@ module HTTPX
           pair.split(/ *= */)
         end]
         @max_requests = parameters["max"].to_i if parameters.key?("max")
-        @keep_alive_timeout = parameters["timeout"].to_i if parameters.key?("timeout")
+        if parameters.key?("timeout")
+          keep_alive_timeout = parameters["timeout"].to_i
+          emit(:timeout, keep_alive_timeout)
+        end
         # TODO: on keep alive timeout, reset
       when /close/i, nil
         disable_pipelining