Update yargs to version 6.4.0 🚀

Hello lovely humans,

yargs just published its new version 6.4.0.

State	Update :rocket:
Dependency	yargs
New version	6.4.0
Type	dependency

This version is not covered by your current version range.

Without accepting this pull request your project will work just like it did before. There might be a bunch of new features, fixes and perf improvements that the maintainers worked on for you though.

I recommend you look into these changes and try to get onto the latest version of yargs. Given that you have a decent test suite, a passing build is a strong indicator that you can take advantage of these changes by merging the proposed change into your project. Otherwise this branch is a great starting point for you to work on the update.

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GitHub Release

Bug Fixes

locales: correct some Russian translations (#691) (a980671)

Features

locales: Added Belarusian translation (#690) (68dac1f)
locales: Create nl.json (#687) (46ce1bb)
update to yargs-parser that addresses #598, #617 (#700) (54cb31d)
yargs is now passed as the third-argument to fail handler (#613) (21b74f9)

Performance Improvements

normalizing package data is an expensive operation (#705) (49cf533)

The new version differs by 121 commits .

bf6707e chore(release): 6.4.0
8507390 chore: add camelcase to greenkeeper ignore, until we drop 0.10 support (#704)
49cf533 perf: normalizing package data is an expensive operation (#705)
8f4c7cf docs: nit, make test description reflect API, not application of API
21b74f9 feat: yargs is now passed as the third-argument to fail handler (#613)
54cb31d feat: update to yargs-parser that addresses #598, #617 (#700)
8bbca63 chore(package): update cross-spawn to version 5.0.1
a980671 fix(locales): correct some Russian translations (#691)
68dac1f feat(locales): Added Belarusian translation (#690)
46ce1bb feat(locales): Create nl.json (#687)
164efb6 chore: upgrade nyc
066613a chore(release): 6.3.0
92aaa7c docs: add new languages to supported locales (#681)
6b85cc6 fix(command): subcommands via commandDir() now supported for parse(msg, cb) (#678)
02c0970 chore: Moved breaking change from "features" to "breaking" in changelog (#677)

There are 121 commits in total. See the full diff.

This pull request was created by greenkeeper.io.

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