Bump mocha from 1.3.0 to 1.4.0

[dependabot-preview[bot]]

Bumps mocha from 1.3.0 to 1.4.0.

Changelog

*Sourced from mocha's [changelog](https://github.com/freerange/mocha/blob/master/RELEASE.md).* > ## 1.4.0 > > * Fix deprecation warning for `assert_nil` in `ClassMethodTest` ([#308](https://github.com/freerange/mocha/issues/308) & [#309](https://github.com/freerange/mocha/issues/309)) > * Display file and line number in deprecation warning - thanks to [**chrisarcand**](https://github.com/chrisarcand) (#310, [#312](https://github.com/freerange/mocha/issues/312) & [#313](https://github.com/freerange/mocha/issues/313)) > * Rename `mocha/mini_test.rb` to `mocha/minitest.rb` - thanks to [**grosser**](https://github.com/grosser) ([#320](https://github.com/freerange/mocha/issues/320) & [#322](https://github.com/freerange/mocha/issues/322)) > * Fix warning when delegating to mock in Ruby 2.4 - thanks to [**tjvc**](https://github.com/tjvc) ([#321](https://github.com/freerange/mocha/issues/321) & [#323](https://github.com/freerange/mocha/issues/323)) > * Updates to Travis CI configuration ([73af600..9732726](https://github.com/freerange/mocha/compare/73af600...9732726) & 0426e5e)

Commits

- [`c0f7b9d`](https://github.com/freerange/mocha/commit/c0f7b9d57d63733d9cf4b9caf5fc9edfc6f65518) Prepare to release v1.4.0 - [`602fa7b`](https://github.com/freerange/mocha/commit/602fa7b24cf735b83677b8999f68db941f68df71) Update release notes - [`9835454`](https://github.com/freerange/mocha/commit/983545462ef07bfbb4af0643c1531bcd85550208) Merge pull request [#323](https://github.com/freerange/mocha/issues/323) from tjvc/fix-delegation-warnings - [`befb416`](https://github.com/freerange/mocha/commit/befb416021b08d663b78024e6537680d93c64ac3) Define respond_to_missing? on Mocha::Mock - [`76aad9c`](https://github.com/freerange/mocha/commit/76aad9c2a9620afd0925dba381a12a3b3658745b) Merge pull request [#322](https://github.com/freerange/mocha/issues/322) from freerange/rename-mini-test-to-minitest - [`55d66ed`](https://github.com/freerange/mocha/commit/55d66ed4f5e6cad95e1605341ec3c608be2c6833) Rename mocha/mini_test.rb to mocha/minitest.rb - [`0426e5e`](https://github.com/freerange/mocha/commit/0426e5ec119bc6a6c0ab256c2b3a8273d798a6c0) Add jruby-head to Travis CI build matrix - [`582ec7e`](https://github.com/freerange/mocha/commit/582ec7eb153e2dd2e6f742744be8b10d69b74abc) Merge pull request [#313](https://github.com/freerange/mocha/issues/313) from freerange/display-file-and-line-number-in-deprec... - [`6e40487`](https://github.com/freerange/mocha/commit/6e404877c1607e95a4a1c666ae88cdee8a19f4d6) Remove debug mode for Mocha::Deprecation - [`b91f26f`](https://github.com/freerange/mocha/commit/b91f26fd31a73f275e90841239f9006e400538ea) Include file & line number in deprecation warnings by default - Additional commits viewable in [compare view](https://github.com/freerange/mocha/compare/v1.3.0...v1.4.0)

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[dependabot-preview[bot]]

Superseded by #1662.