Update dependencies. (#149)

Update `protocol-http`, `protocol-http1` and `protocol-http2` all which contain minor bug fixes and improvements.

Author: ioquatix

async-http.gemspec

@@ -22,9 +22,8 @@ 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 "base64"
-	spec.add_dependency "protocol-http", "~> 0.25.0"
-	spec.add_dependency "protocol-http1", "~> 0.17.0"
-	spec.add_dependency "protocol-http2", "~> 0.15.0"
+	spec.add_dependency "protocol-http", "~> 0.26.0"
+	spec.add_dependency "protocol-http1", "~> 0.18.0"
+	spec.add_dependency "protocol-http2", "~> 0.16.0"
 	spec.add_dependency "traces", ">= 0.10.0"
 end