Update tap to version 5.1.0 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

tap just published its new version 5.1.0, which is not covered by your current version range.

If this pull request passes your tests you can publish your software with the latest version of tap – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging :palm_tree:

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The new version differs by 17 commits .

• 6a4f6ff v5.1.0
• ca27c6b changelog for 5.1
• 77383f7 update cli info in readme
• c6f09ff Merge branch 'flags-n-stuff'
• 298287a test of throwing errors after end() is called
• c1d233d add another setTimeout test
• cdc1afa thorougher --check-coverage tests
• 482e900 ignore soe of the flakier request/sigterm handling stuff
• a3a9bc9 remove dead code in synonyms module
• 929bdb7 use isexe module
• ab208e8 more coverage-related tests for runner
• 2af06c5 bump stack-utils to 0.3.0
• b9ddd71 clean up how nyc is used for check-coverage and report
• bc11f8e remove unused mkdirp dep
• 86f877c Add support for more --nyc stuff on the cli

There are 17 commits in total. See the full diff.

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