added "enabled" field for notification rule

[pawelsz-rb]

Description of the change

Added enabled boolean field (true/false) for rule notification. The change is backward compatible; disabled rule (enabled = false) will not be triggered.

The field is set to true by default.

Type of change

• [ ] Bug fix (non-breaking change that fixes an issue)
• [x] New feature (non-breaking change that adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Maintenance
• [ ] New release

Checklists

Development

• [ ] Lint rules pass locally
• [ ] The code changed/added as part of this pull request has been covered with tests
• [ ] All tests related to the changed code pass in development

Code review

• [ ] This pull request has a descriptive title and information useful to a reviewer. There may be a screenshot or screencast attached
• [ ] "Ready for review" label attached to the PR and reviewers assigned
• [ ] Issue from task tracker has a link to this pull request
• [ ] Changes have been reviewed by at least one other engineer

[coveralls]

Pull Request Test Coverage Report for Build 9879943504

Details

• 4 of 4 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 92.097%

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Totals
Change from base Build 8908048250:	0.0%
Covered Lines:	1480
Relevant Lines:	1607

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💛 - Coveralls

[codeclimate[bot]]

Code Climate has analyzed commit d4d53392 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 92.0% (0.0% change).

View more on Code Climate.