enhancement(slack): add more user fields from slack api

[Empyreus]

❤ THANKS FOR HELPING OUT :D

Proposed change

Added more user fields for usage in bot from Slack API

Types of changes

What types of changes is this pull request introducing to flottbot? Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

You can fill this out after creating your PR. Put an x in the boxes that apply

• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

[coveralls]

Pull Request Test Coverage Report for Build 272

• 0 of 38 (0.0%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.5%) to 37.945%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
remote/slack/helper.go	0	38	0.0%

Files with Coverage Reduction	New Missed Lines	%
remote/slack/helper.go	1	0%

Totals
Change from base Build 268:	-0.5%
Covered Lines:	820
Relevant Lines:	2161

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💛 - Coveralls

[wass3r]

was able to test. looks good - thank you. before merging, could you please run go fmt remote/slack/helper.go (there will be some changes coming to the build pipeline where we make sure this was run to ensure consistent formatting)

[wass3r]

lgtm