Relax as_json test pattern.

Author: ioquatix

test/async/http/protocol/http2.rb

@@ -17,7 +17,7 @@
 			response = client.get("/")
 			connection = response.connection
 
-			expect(connection.as_json).to be == "#<Async::HTTP::Protocol::HTTP2::Client 1 requests, 0 active streams>"
+			expect(connection.as_json).to be =~ /#<Async::HTTP::Protocol::HTTP2::Client 1 requests, \d+ active streams>/
 		ensure
 			response&.close
 		end