Update coveralls to version 2.11.6 🚀

[greenkeeperio-bot]

Hello 👋

🚀🚀🚀

coveralls just published its new version 2.11.6, 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 coveralls – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging 🌴

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The new version differs by 11 commits .

• 8c06415 Merge branch 'master' of github.com:nickmerwin/node-coveralls
• 83c3dfd version bump
• ddc813c Merge pull request #77 from addaleax/write-to-stdout
• 9c6a832 Use container-based infrastructure for Travis CI testing
• c69ded1 Modify tests to use the minimist options object for filepath detection
• a67629c Use index.options object for determining getOptions()’ filepath
• 125d8b1 Modify tests to reflect minimist usage
• be2f7b8 Use minimist to parse command line options
• 879fb9e Change write-to-stdout option to--stdout/-s``
• d8a0155 Remove unneccessary 'streams' require() in test case
• 7d9d9a4 Add command line option to write output to stdout

See the full diff.

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