Update grunt-gh-pages to version 1.1.0 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

grunt-gh-pages just published its new version 1.1.0, 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 grunt-gh-pages – 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 5 commits .

• 20dab19 1.1.0
• 0ef1bc2 Merge pull request #57 from gruntjs-updater/peerDep
• 61c47af Update peerDependencies to support Grunt 1.0
• a4a8872 Merge pull request #54 from tan9/patch-1
• abed49a Fix typo.

See the full diff.

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