Update dependency grunt-coveralls to v2

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
grunt-coveralls	devDependencies	major	0.3.0 -> 2.0.0

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Release Notes

pimterry/grunt-coveralls

### [`v2.0.0`](https://togithub.com/pimterry/grunt-coveralls/compare/v1.0.1...v2.0.0) [Compare Source](https://togithub.com/pimterry/grunt-coveralls/compare/v1.0.1...v2.0.0) ### [`v1.0.1`](https://togithub.com/pimterry/grunt-coveralls/releases/v1.0.1) [Compare Source](https://togithub.com/pimterry/grunt-coveralls/compare/v1.0.0...v1.0.1) Updated for compatibility with Grunt 1.0 ### [`v1.0.0`](https://togithub.com/pimterry/grunt-coveralls/releases/v1.0.0) [Compare Source](https://togithub.com/pimterry/grunt-coveralls/compare/v0.3.0...v1.0.0) Official stable 1.0.0 release. This is a fairly small release in itself (adds some error logging, updates some dependencies), but marks the point where grunt-coveralls is stable, and unlikely to dramatically in future.

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