1.5.0 aka "Special Hacktoberfest 2017"

🎃 For this special event https://hacktoberfest.digitalocean.com/ a release will be made with all contrib at the end of october.

new modules:

• reddit
• mastodon

improvements:

• the UI of the Service management is simplier
• you can setup trigger-happy without editing th_settings.py
  create a .env (by copying env.sample) and set the value of the service you use and have registered
• installation now add fixtures to enable all the provided services
• doc - split in 4 : installation guide/admin guide/user guide/docker guide
• the project now collect stat about the health of the triggers