Bump mocha from 2.4.0 to 2.4.2

[dependabot[bot]]

Bumps mocha from 2.4.0 to 2.4.2.

Changelog

Sourced from mocha's changelog.

2.4.2

External changes

• Don't trust Object#is_a? in presence of mock objects (#656) - thanks to @​casperisfine

2.4.1

External changes

• Fix regression in matchers when used with keyword arguments (#654 & #655) - thanks to @​ElvinEfendi for reporting

Internal changes

• Reduce duplication & consolidate #to_matcher method definitions (600ee2aa, e9de64e4, #655)
• Change #to_matcher method to use keyword arguments (3b60b7df, #655)

Commits

• e62fa61 [skip ci] Update documentation for v2.4.2
• 0e63c0f Bump version to 2.4.2 & prepare for release
• d57a087 Don't trust Object#is_a? in presence of Mocks
• 8bc7949 [skip ci] Fix release notes for v2.4.1
• a6b047c [skip ci] Update documentation for v2.4.1
• d408ed1 Bump version to 2.4.1 & prepare for release
• c216167 Merge pull request #655 from freerange/fix-has-entry-with-keyword-args-regres...
• 3b60b7d Change to_matcher method to take keyword arguments
• e9de64e Consolidate to_matcher definitions in one place
• 600ee2a Reduce duplication in to_matcher methods
• Additional commits viewable in compare view

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