Relax dependency on protocol-http.

Author: ioquatix

async-http.gemspec

@@ -20,7 +20,7 @@ Gem::Specification.new do |spec|
 	spec.add_dependency "async", ">= 1.25"
 	spec.add_dependency "async-io", ">= 1.28"
 	spec.add_dependency "async-pool", ">= 0.2"
-	spec.add_dependency "protocol-http", "~> 0.23.1"
+	spec.add_dependency "protocol-http", "~> 0.23"
 	spec.add_dependency "protocol-http1", "~> 0.14.0"
 	spec.add_dependency "protocol-http2", "~> 0.14.0"
 	spec.add_dependency "traces", ">= 0.8.0"