Support OTP 25: up websocket_client version#256

natali-maximenko wants to merge 1 commit intoBlakeWilliams:masterBlakeWilliams/Elixir-Slack:masterfrom

natali-maximenko:websocket-client-up-versionnatali-maximenko/Elixir-Slack:websocket-client-up-versionCopy head branch name to clipboard