Bump amphp/amp from 2.1.1 to 2.2.0

[dependabot-preview]

Bumps amphp/amp from 2.1.1 to 2.2.0.

Release notes

Sourced from amphp/amp's releases.

2.2.0

• Added CombinedCancellationToken
• Added delay() as shortcut for new Delayed

2.1.2

• Fixed issue where the loop time in NativeDriver was not refreshed after waiting for I/O streams (#256)
• Fixed compatibility issue of NativeDriver with pcntl_async_signals() (#264)
• A custom queue is now used for timers in NativeDriver to allow cancelled timers to be garbage collected immediately instead of after their original expiration time (#220)
• Resolving a promise with an object that throws when destructed will now forward that exception to the event loop error handler (#271)
• Fixed loop time to support 32-bit systems (#252, #273)

Commits

• c6a775a Add delay function (#278)
• b57fc2e Remove PHP 7.1 feature usage for 7.0 compat
• d4fc8ce Add CombinedCancellationToken
• f824f0d Ignore code coverage for getCurrentTime on 32 bit
• 72a0db5 Warn if time is about to overflow on 32 bit
• 8b38da2 Support 32-bit platforms
• 5316e74 Different approach for 32-bit support
• 1541424 Remove Gemfile.lock
• 0240f01 Bump nokogiri from 1.8.2 to 1.10.3 in /docs (#272)
• a4fd818 Swap sign of returned time on 32-bit systems
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #31.