1.0.0 RC2

• Fixed marking that peer initiated close when remote socket closes.
• Close promise is now resolved with the close code and reason in a two-element array.
• Promise returned from Rfc6455Client::receive() is now failed if the connection closes with a non-normal close code instead of resolving with null (which remains the case on normal closure). (#5)
• Added Code::getName(int $code) that returns the constant name for the given code or null if it is not defined.
• Timestamps in ClientMetadata are now set using Amp\getCurrentTime() instead of time().