Update gulp-rev to version 7.0.0 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

gulp-rev just published its new version 7.0.0, 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 gulp-rev – 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 10 commits (ahead by 10, behind by 8).

• 0e00baf 7.0.0
• b51287c Fix multiple base paths
• 7febb9e Update readme.md
• dfbb4a9 6.0.1
• c6e97c1 Close #121 PR: Correctly handle a dot in the path. Fixes #88
• 77753b5 6.0.0
• cd5b8f1 add XO
• 5eb2015 cleanup #120
• 10e914f Close #120 PR: transformFilename treats the extension as being after the first dot. Fixes #88
• 1e144db 5.1.0

See the full diff.

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