Update yo to version 1.8.1 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

yo just published its new version 1.8.1, 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 yo – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging :palm_tree:

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GitHub Release

Update the autocompletion tool to fix some issues for people using bash.

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The new version differs by 8 commits .

• b7a2c96 1.8.1
• 6525a66 1.8.0
• 1240864 Bump dev dependencies
• c0a5c21 Add Node v6 to travis
• 7b50265 Add completion based on env.getGeneratorsMeta() and --help (#426)
• e9c2440 1.7.1
• 069fb07 Bump yeoman-environment
• f9bf583 package.json tweaks

See the full diff.

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