Honor new Group Functionality introduced in Apprise v1.6.0

[caronc]

Description:

Related issue (if applicable): refs #146

This pull request so far just re-produces the problem with a test case.

Issue directly relates to here where the issue was resolved. This PR can be pushed after Apprise is updated

Checklist

• [ ] The code change is tested and works locally.
• [x] There is no commented out code in this PR.
• [x] No lint errors (use flake8)
• [x] Tests added

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (4ad2bb1) 95.23% compared to head (dc59948) 94.87%. Report is 1 commits behind head on master.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #147 +/- ## ========================================== - Coverage 95.23% 94.87% -0.37% ========================================== Files 7 7 Lines 714 702 -12 ========================================== - Hits 680 666 -14 - Misses 34 36 +2 ```

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