chore(deps): update dependency sinon to ^7.2.6

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
sinon	devDependencies	patch	^7.2.2 -> ^7.2.6	homepage, source

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Release Notes

sinonjs/sinon

### [`v7.2.6`](https://togithub.com/sinonjs/sinon/blob/master/CHANGELOG.md#​726--2019-03-01) [Compare Source](https://togithub.com/sinonjs/sinon/compare/v7.2.5...v7.2.6) ================== - Upgrade [@​sinonjs/formatio](https://togithub.com/sinonjs/formatio) - Set `fake.lastArg` to last argument regardless of type ### [`v7.2.5`](https://togithub.com/sinonjs/sinon/blob/master/CHANGELOG.md#​725--2019-02-27) [Compare Source](https://togithub.com/sinonjs/sinon/compare/v7.2.4...v7.2.5) ================== - don't call extends.nonEnum in spy.resetHistory ([#​1984](https://togithub.com/sinonjs/sinon/issues/1984)) ### [`v7.2.4`](https://togithub.com/sinonjs/sinon/blob/master/CHANGELOG.md#​724--2019-02-18) [Compare Source](https://togithub.com/sinonjs/sinon/compare/v7.2.3...v7.2.4) ================== - minor package updates - Update eslint-plugin-mocha - Fix high prio audit warnings - Update nise to use [@​sinonjs/text-encoding](https://togithub.com/sinonjs/text-encoding) - Make all properties non-enumerable in spies, stubs, mocks and fakes - docs(sandbox): add example for default sandbox ### [`v7.2.3`](https://togithub.com/sinonjs/sinon/blob/master/CHANGELOG.md#​723--2019-01-19) [Compare Source](https://togithub.com/sinonjs/sinon/compare/v7.2.2...v7.2.3) ================== - Update [@​sinonjs/nise](https://togithub.com/sinonjs/nise) - Fix stubbing function objects ([#​1968](https://togithub.com/sinonjs/sinon/issues/1968))

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