A major compatibility release to update this component to support all latest ReactPHP components!

This update involves a minor BC break due to dropped support for legacy versions. We've tried hard to avoid BC breaks where possible and minimize impact otherwise. We expect that most consumers of this package will actually not be affected by any BC breaks, see below for more details.

• BC break: Remove deprecated API and mark Sender as @internal only, remove all references to legacy SocketClient component and remove support for Unix domain sockets (UDS) for now (#77, #78, #81 and #83 by @clue)

  All of this affects the Sender only, which was previously marked as "advanced usage" and is now marked @internal only. If you've not used this class before, then this BC break will not affect you. If you've previously used this class, then it's recommended to first update to the intermediary v1.4.0 release, which allows you to use a standard ConnectorInterface instead of the Sender and then update to this version without causing a BC break. If you've previously used Unix domain sockets (UDS), then you're recommended to wait for the next version.

• Feature / BC break: Forward compatibility with future Stream v1.0 and strict stream semantics (#79 by @clue)

  This component now follows strict stream semantics. This is marked as a BC break because this removes undocumented and untested excessive event arguments. If you've relied on proper stream semantics as documented before, then this BC break will not affect you.

• Feature: Forward compatibility with future Socket and EventLoop components (#80 by @clue)