Update tap to version 5.4.0 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

tap just published its new version 5.4.0, 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 14 commits .

• ac57481 v5.4.0
• 593e16e changelog
• af950d1 Check type if provided Error class in t.throws
• 859a64f v5.3.0
• 66df820 changelog for 5.3
• 1113352 Merge branch 'promises'
• b65d956 fix travis badge
• 4803441 docs for promise api support
• d1958e4 a test where some promises fail
• 20ee41f timeout test: allow more time for CI servers
• 06ad706 Handle promise rejection with t.threw
• 3726d35 test: remove dead code
• e87b259 add tests of more test object edge cases
• 9b8273a return a promise from t.test

See the full diff.

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