Reduce logger noise.

Author: dblock

CHANGELOG.md

@@ -1,7 +1,7 @@
 ### 0.14.2 (Next)
 
 * [#256](https://github.com/slack-ruby/slack-ruby-client/pull/256): Added support for specifying signing secrets on a per-request basis via optional parameters to the `Slack::Events::Request` constructor - [@gabrielmdeal](https://github.com/gabrielmdeal).
-* [#262](https://github.com/slack-ruby/slack-ruby-client/pull/262): Better handling of `disconnect!`/`close` - [@ioquatix](https://github.com/ioquatix).
+* [#257](https://github.com/slack-ruby/slack-ruby-client/pull/257), [#262](https://github.com/slack-ruby/slack-ruby-client/pull/262): Fixed occasional failures to reconnect - [@ioquatix](https://github.com/ioquatix), [@dblock](https://github.com/dblock).
 * Your contribution here.
 
 ### 0.14.1 (2019/2/26)

lib/slack/real_time/concurrency/async.rb

@@ -44,8 +44,13 @@ def start_reactor(client)
                 @client_task.stop if @client_task
 
                 @client_task = task.async do |subtask|
-                  subtask.annotate 'client run-loop'
-                  client.run_loop
+                  begin
+                    subtask.annotate 'client run-loop'
+                    client.run_loop
+                  rescue ::Async::Wrapper::Cancelled => e
+                    # Will get restarted by ping worker.
+                    client.logger.warn(subtask.to_s) { e.message }
+                  end
                 end
 
                 @restart.wait