Changedetection Service

[mariosemes]

Description

Added Changedetection.io service. https://github.com/dgtlmoon/changedetection.io

How Has This Been Tested?

Tested on fresh cb installation, Ubuntu 18.04 server, online and offline multiple times.

New Role Checklist:

• [x] I have reviewed the Contribute page in the wiki
• [x] I have updated the header in any files I may have used as templates with my own information
• [x] I have added my new role to appveyor.yml
• [x] I have added my new role to community.yml
• [x] I have verified that any Docker images used are current and supported.
• [x] I have made corresponding changes to the documentation

[saltydk]

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