remove the hashtag of slack channel name in the default config
remove the hashtag of slack channel name in the default config

In YAML hashtag starts a comment. Removed hashtag of default channel
name and added comment that no hastag is needed.

elliotfehr/acmephp,jankal/acmephp,elliotfehr/acmephp,jankal/acmephp,acmephp/acmephp,acmephp/acmephp