Update noflo to version 0.5.21 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

noflo just published its new version 0.5.21, 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 noflo – 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 53 commits .

• f36c4da Make component loader paths relative in cache
• ec08d20 NoFlo: what is it good for
• 46658ad README: Highlight topics in tools
• e8b2aa8 Bump
• 6da7eec Merge pull request #348 from noflo/debug_by_default
• 8eaeda8 Note how to disable debug mode
• 07ccb80 Don't instruct global installs
• 6d4a319 Update readme with refs to some modern NoFlo tools
• db0a17b Show and exit on processing errors
• 94f67bc listenerCount is only available in newer Node.js
• 4857d21 Add test for process-error
• 3a554b2 Throw unobserved errors
• 1e781f1 Enable debug mode by default
• 5e731b0 Set up component list before reading cache
• c12ba2d Bump

There are 53 commits in total. See the full diff.

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