Update sinon requirement from ~1.7.3 to ~2.4.1

[dependabot-preview]

Updates the requirements on sinon to permit the latest version.

Changelog

Sourced from sinon's changelog.

2.4.1 / 2017-07-26

• stub#withArgs: set promiseLibrary correctly (#1497)

2.4.0 / 2017-07-26

• Allow anonymous mock functions to be named

2.3.8 / 2017-07-13

• Fix 1474: propagates promiseLibrary to new stub behaviors (#1484)

2.3.7 / 2017-07-10

• Fix #1476: spy.withArgs(args...).firstCall is broken

2.3.6 / 2017-06-28

• Fix #1274: spy.withArgs(args...).callCount is incorrect

2.3.5 / 2017-06-20

• Check configurable on a prop before creating (fixes #1456) (#1462)

2.3.4 / 2017-06-10

• Fix #1372: make sandbox.resetHistory also reset spies (#1424)

2.3.3 / 2017-06-10

• Fix #1445: make stubbing of static function properties possible

2.3.2 / 2017-05-26

• Fix failing sandbox.resetBehavior() (#1428)
• Fix restoring getters/setters/values for previously unexisting props (#1419)
• Called in order takes callCount into account. Closes #1398.

2.3.1 / 2017-05-23

... (truncated)

Commits

• dfef160 2.4.1
• 92e005f Update Changelog.txt and AUTHORS for new release
• d5e4f04 stub#withArgs: set promiseLibrary correctly (#1497)
• 20eb865 Update docs/changelog.md and set new release id in docs/_config.yml
• e333e75 Add release documentation for v2.4.0
• fde7911 2.4.0
• 9afdcfc Update Changelog.txt and AUTHORS for new release
• 57bb8b3 Merge pull request #1489 from Rowno/named-anonymous-mocks
• c9a35ef Update fake-xhr-and-server.md
• 837ec0c Allow anonymous mock functions to be named
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot close will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
• @dependabot use these labels will set the current labels as the default for future PRs for this repo and language
• @dependabot use these reviewers will set the current reviewers as the default for future PRs for this repo and language
• @dependabot use these assignees will set the current assignees as the default for future PRs for this repo and language
• @dependabot use this milestone will set the current milestone as the default for future PRs for this repo and language
• @dependabot badge me will comment on this PR with code to add a "Dependabot enabled" badge to your readme

Additionally, you can set the following in your Dependabot dashboard:

• Update frequency (including time of day and day of week)
• Pull request limits (per update run and/or open at any time)
• Out-of-range updates (receive only lockfile updates, if desired)
• Security updates (receive only security updates, if desired)

Finally, you can contact us by mentioning @dependabot.