Update songdown-transpose to version 0.4.0 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

songdown-transpose just published its new version 0.4.0, 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 songdown-transpose – 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 9 commits .

• 3418000 Release 0.4.0
• febb1c8 Prep release
• 7d0ea33 better release notes
• 4289553 Update license note
• 15ee717 Reaplce Code Climate badge with standard badge.
• 43787ac Update Travis CI platforms
• 00f65dd New testing stuff
• 94535d5 Merge pull request #2 from 1vasari/greenkeeper-update-all
• 687c47f chore(package): update dependencies

See the full diff.

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