Fix icon url
Merge pull request #8 from eddiezane/icon

Fix icon url
Add a warning if icon does not exist. Fixes #9
Merge pull request #10 from eddiezane/iconerror

Add a warning if the icon does not exist
Merge branch 'master' into notify_channel_name

* master:
  Add a warning if icon does not exist. Fixes #9
  Fix icon url