fix(deprecation): use `async_update_entry` when handling config entries

[palazzem]

Related Issues

• Closes #156

Proposed Changes:

Config entries are updated using async_update_entry instead of using config attributes directly. In particular:

• Migrations don't use config.version = 2 anymore
• Tests don't use a custom MockConfigEntry mock, in favor of the one provided by hass.fixtures (original HA fixtures)
• All tests are updated to use both the MockConfigEntry and async_update_entry

Testing:

n/a

Extra Notes (optional):

n/a

Checklist

• [x] Related issues and proposed changes are filled
• [x] Tests are defining the correct and expected behavior
• [x] Code is well-documented via docstrings

[coveralls]

Pull Request Test Coverage Report for Build 8189921946

Details

• 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.01%) to 93.979%

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Totals
Change from base Build 8160514738:	-0.01%
Covered Lines:	674
Relevant Lines:	721

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💛 - Coveralls