Update sinon requirement from 2.0.0-pre.2 to 7.3.2

[dependabot-preview]

Updates the requirements on sinon to permit the latest version.

Changelog

Sourced from sinon's changelog.

7.3.2 / 2019-04-17

• Update Lolex to bring in fix for requiring lolex prints a warning sinonjs/fake-timers#232 (queueMicrotask warning)

7.3.1 / 2019-03-27

• Fix security issues
• Update @sinonjs/samsam to v3.3.1

7.3.0 / 2019-03-20

• Simplify Circle CI setup
• Add a Docker Compose config file for testing the setup locally
• Inject createStubInstance and fake functionality
• Remove unused prop 'injectIntoThis'
• Fix #1974 by upgrading to @sinonjs/samsam@3.3.0

7.2.7 / 2019-03-04

• Retain spy function names and fix spy.named(name) (#1987)
• Document spying on accessors (#1976)

7.2.6 / 2019-03-01

• Upgrade @sinonjs/formatio
• Set fake.lastArg to last argument regardless of type

7.2.5 / 2019-02-27

• don't call extends.nonEnum in spy.resetHistory (#1984)

7.2.4 / 2019-02-18

• minor package updates
• Update eslint-plugin-mocha
• Fix high prio audit warnings
• Update nise to use @sinonjs/text-encoding
• Make all properties non-enumerable in spies, stubs, mocks and fakes
• docs(sandbox): add example for default sandbox

7.2.3 / 2019-01-19

... (truncated)

Commits

• 585a1e9 7.3.2
• b51901d Update CHANGELOG.md and AUTHORS for new release
• 83861a7 Update Lolex to bring in fix for requiring lolex prints a warning sinonjs/fake-timers#232
• 2430fd9 Documentation (#2004)
• 3812a7d Update docs/changelog.md and set new release id in docs/_config.yml
• 93bef55 Add release documentation for v7.3.1
• e02c192 7.3.1
• 8ee1d35 Update CHANGELOG.md and AUTHORS for new release
• bc53d82 Fix security issues
• 1a09166 Update @sinonjs/samsam to v3.3.1
• Additional commits viewable in compare view

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[coveralls]

Coverage remained the same at 82.353% when pulling 1e84e78 on dependabot/npm_and_yarn/sinon-7.3.2 into e0c50a0 on master.