Socketioxide v0.18.1

• fix: issue #627. In case of namespace connect failure,
  the socket was not properly removed from the adapter and the namespace.

What's Changed

• fix(socketio/ns): remove socket in case of ns connect failure by @Totodore in #655, thanks @Julian332 to the bug report!
• chore(socketio): v0.18.1 by @Totodore in #657

Full Changelog: socketioxide-v0.18.0...socketioxide-v0.18.1