Update sinon to version 1.17.3 🚀

[greenkeeperio-bot]

Hello :wave:

:rocket::rocket::rocket:

sinon just published its new version 1.17.3, which is not covered by your current version range.

If this pull request passes your tests you can publish your software with the latest version of sinon – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging :palm_tree:

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The new version differs by 9 commits .

• 68bcf73 1.17.3
• 85cdbaf Update authors and changelog before release
• e724d33 Merge pull request #970 from atlassian/backport-833
• 3539fa4 fix: toString calls (backport of 7a18eb5f73326addad2f13b7af41e02e7790b861)
• 93888ff Merge pull request #935 from fatso83/backport-pr-930
• 7d6ce38 Ensure sinon can run in a WebWorker
• cab1eb4 Merge pull request #908 from Serfenia/v1.17
• 3334a0c Changed the priority of which global is chosen first.
• 7565e83 Fixed #785 by checking the global variables are set

See the full diff.

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