Support for Apprise v1.7.x

[caronc]

Description:

Related issue (if applicable): refs n/a

Support Apprise v1.7.x

Checklist

• [x] 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 (06275be) 94.87%.

:exclamation: Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #159 +/- ## ========================================== - Coverage 95.23% 94.87% -0.37% ========================================== Files 7 7 Lines 714 702 -12 ========================================== - Hits 680 666 -14 - Misses 34 36 +2 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.