chore(deps): update dependency sinon to v7

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
sinon	devDependencies	major	6.1.4 -> 7.0.0	homepage, source

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Release Notes

sinonjs/sinon

v7.0.0

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• Update to Lolex 3: no negative ticks allowed

v6.3.5

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• Upgrade lolex
• Upgrade @​sinonjs/samsam - fixes minor issue with IE11 introduced in 6.3.4

v6.3.4

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• Update samsam, puppeteer and rollup
• Fix #​1850 (keep context in fakes)

v6.3.3

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• Upgrade formatio, samsam, nise and referee

v6.3.2

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• Adds guard for empty properties in deepEqual when a matcher is provided (#​1901)

v6.3.1

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• Fix use of non-cached reference to forEach

v6.3.0

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• Allow providing stubs overrides for sinon.createStubInstance (#​1864)
• Bump Lolex to 2.7.4 to include IE fixes for performance.mark

v6.2.0

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• Add mock.usingPromise to set the Promise library for mock expectations

v6.1.6

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• Upgrade Lolex, Nise and other dependencies

v6.1.5

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• Fix #​1796, failing to stub Array.prototype.sort

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[codecov]

Codecov Report

Merging #50 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #50   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      1           
  Lines          38     38           
=====================================
  Hits           38     38

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