Log Message:
www/ruby-em-websocket: update to 0.5.2

Update ruby-em-websocket to 0.5.2

0.5.2 (2020-09-23)

No release note nor changelog is available.  Please refer
<https://github.com/igrigorik/em-websocket/compare/v0.5.1...v0.5.2>
in detail.