Update mocha requirement from ~> 1.1 to ~> 2.0

[dependabot]

Updates the requirements on mocha to permit the latest version.

Changelog

Sourced from mocha's changelog.

2.0.0

External changes

• Remove support for Ruby v1.9 - thanks to @​wasabigeek (#552)
• Support strict keyword argument matching - see docs for Expectation#with & Configuration#strict_keyword_argument_matching= - thanks to @​wasabigeek (#446,#535,#544,#562)
• Deprecate Hash args that don't strictly match (#563,981c31be)
• Drop support for older versions of test-unit - gem versions of test-unit earlier than v2.5.1 and versions of test-unit from the Ruby v1.8 standard library are no longer supported (#540,969f4845)
• Drop support for older versions of minitest - versions of minitest earlier than v3.3.0 are no longer supported (#541,ca69dc9e)
• Remove deprecated mocha/setup.rb mechanism (642a0ff4)
• Add missing docs for API#stub parameter (257b4cb4)
• Remove optional reinstatement of v1.9 behaviour (#436,#438,#569,1473ee25)
• Remove deprecated methods in Configuration (#421,e7ff7528)
• Fail fast when mock receives invocations in another test (#440,#442,cb054d59)
• Improve docs re using matchers in Expectation#with (da7237cd)
• Expand Expectation#with docs re keyword arguments (fed6808d)
• Improve docs for strict_keyword_argument_matching (8d8f881d)
• Remove deprecated Rails plugin init.rb file (1c617175)
• Improve strict keyword argument matching deprecation warning by including the source location of the stub definition (77c0d4cc)
• Add README section re semantic versioning (00758246)

Internal changes

• Separate linting from tests in terms of Rake tasks & CircleCI jobs - thanks to @​wasabigeek (#556)
• Remove tests specific to Ruby v1.8 behaviour (46fca7ac, 3b369e99)
• Multi-line rubocop disable in Mock#method_missing (af2194c4)
• Remove unused arg for HashMethods#mocha_inspect (4f59e27f)
• Improve test runner assertions - failure vs error (eec7200a)
• Improve test coverage of PositionalOrKeywordHash (c294fe70)
• More consistent Test::Unit & Minitest integration (27dd3817)
• Remove redundant require statements (d82218a8,fa17b114)
• Add missing require statement (73493761)
• Disable Style/Semicolon cop globally (8cd0b705)

1.16.0

External changes

• Default Configuration#reinstate_undocumented_behaviour_from_v1_9= to false (6fcaf947)
• Deprecate Configuration#reinstate_undocumented_behaviour_from_v1_9= (a797c5fd)

Internal changes

• Remove redundant deprecation disabling in MockTest (dc8ca969)

1.15.0

External changes

... (truncated)

Commits

• c5cf324 [skip ci] Update documentation for v2.0.0.
• fcd5450 Bump version to 2.0.0 & prepare for release
• 0075824 Add README section re semantic versioning
• 1099679 Improve docs for strict keyword argument matching
• a5e07fc [skip ci] Add v1.16.0 into release docs
• e32e9e5 [skip ci] Update documentation for v2.0.0.alpha.1
• 90e1157 Bump version to 2.0.0.alpha.1 & prepare for release
• 77c0d4c Improve keyword argument deprecation warning
• 8cd0b70 Disable Style/Semicolon cop globally
• 9cd08be [skip ci] Update documentation for v2.0.0.alpha
• Additional commits viewable in compare view

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