Fix compatibility with io-stream changes.

lib/falcon/command/supervisor.rb

@@ -40,8 +40,8 @@ class Metrics < Samovar::Command
 
 				# Send the metrics message to the supervisor and print the results.
 				def call(stream)
-					stream.puts({please: 'metrics'}.to_json, separator: "\0")
-					response = JSON.parse(stream.gets("\0"), symbolize_names: true)
+					stream.puts({please: 'metrics'}.to_json, separator: "\0", chomp: true)
+					response = JSON.parse(stream.read_until("\0"), symbolize_names: true)
 
 					$stdout.puts response
 				end

lib/falcon/service/supervisor.rb

@@ -74,7 +74,7 @@ def setup(container)
 						@bound_endpoint.accept do |peer|
 							stream = ::IO::Stream(peer)
 
-							while message = stream.gets("\0")
+							while message = stream.read_until("\0")
 								response = handle(JSON.parse(message, symbolize_names: true))
 								stream.puts(response.to_json, separator: "\0")
 							end
@@ -101,7 +101,7 @@ def invoke(command)
 
 					stream.puts(command.to_json, separator: "\0")
 
-					response = JSON.parse(stream.gets("\0"), symbolize_names: true)
+					response = JSON.parse(stream.read_until("\0"), symbolize_names: true)
 
 					return response
 				end