Update yargs to version 4.7.0 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

yargs just published its new version 4.7.0, 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 yargs – 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 13 commits .

• f1e8d8a chore(package): update standard to version 7.0.0 (#493)
• 82d4412 chore: fix up corrupt changelog
• 68b59d0 chore(release): 4.7.0
• 5e48074 chore: upgrade nyc and standard-version
• 8ce6a8b chore(package): update nyc to version 6.4.1 (#490)
• 74fcfbc feat(completion): allow to get completions for any string, not just process.argv (#470)
• b900502 fix(pkgConf): fix aliases issues in .pkgConf() (#478)
• e0a7e05 feat(configuration): Allow to directly pass a configuration object to .config() (#480)
• 44883f0 docs: Moving 'else' to the same line as closing curly brace in example code (#483)
• 62378d9 chore: Update AppVeyor and Travis configuration for Node.js v6 (#488)
• d72badb feat(validation): Add .skipValidation() method (#471)
• 6700cfd docs(default): Document deprecated alias of default() (#481)
• 1279890 chore: overhauled travis configuration thanks @maxrimue (#482)

See the full diff.

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