Add xt/consistent_version.t to check modules all have the same version.
remove xt/pod-coverage.t. sometimes it's necessary not to document public methods. They are distro-private methods.
WebSocket, WebSocket::Connection: set $VERSION with string literals. I used $Plack::App::WebSocket::Connection::VERSION for $Plack::App::WebSocket::VERSION, but sometimes installation failed because VERSION was inspected before prerequisites were installed (loading Connection.pm failed).
Update Changes.