`Set::union()` method added

[Smoren]

Hi @markrogoyski,

I've added new methods and covered them by tests:

• Set::union()
• Set::unionCoercive()
• Stream::unionWith()
• Stream::unionCoerciveWith()

[coveralls]

Pull Request Test Coverage Report for Build 4368218265

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 6 of 6 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.001%) to 99.868%

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Totals
Change from base Build 4361445493:	0.001%
Covered Lines:	758
Relevant Lines:	759

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💛 - Coveralls

[Smoren]

This branch is rebased from develop.

[markrogoyski]

Hi @Smoren,

Thanks for the PR. It's neat that you were able to make use of partialIntersection to implement it.

Mark

[Smoren]

Thank you for merging this PR!