message: Allow to use : inside channel name
diff: @@ -377,7 +377,9 @@ class BaseServer {
  }
  let channel = Object.assign({}, callbacks)
  if (typeof pattern === 'string') {
  - channel.pattern = new UrlPattern(pattern)
  + channel.pattern = new UrlPattern(pattern, {
  + segmentValueCharset: 'a-zA-Z0-9:_-'
  + })
  } else {
  channel.regexp = pattern
  }
  