Allow Async::HTTP::Internet methods to accept URI::HTTP objects. (#118)

* `URI::HTTP` objects do not define a `to_str` method, so use `to_s` instead.

Author: postmodern

lib/async/http/endpoint.rb

@@ -39,7 +39,7 @@ def self.[](url)
 				if url.is_a?(Endpoint)
 					return url
 				else
-					Endpoint.parse(url.to_str)
+					Endpoint.parse(url.to_s)
 				end
 			end
 

test/async/http/internet.rb

@@ -23,6 +23,15 @@
 		response.close
 	end
 
+	it "can accept URI::HTTP objects" do
+		uri = URI.parse("https://www.codeotaku.com/index")
+		response = internet.get(uri, headers)
+		
+		expect(response).to be(:success?)
+	ensure
+		response&.close
+	end
+	
 	let(:sample) {{"hello" => "world"}}
 	let(:body) {[JSON.dump(sample)]}