Merge PromiseInterface, ExtendedPromiseInterface and
CancellablePromiseInterface into a single PromiseInterface.
The CancellablePromiseInterface is kept for backward compatibility
but is marked as deprecated and must not be used anymore.
Closes #44

clue approved these changes Jan 4, 2017

davidcole1340 added a commit to davidcole1340/reactphp-block that referenced this pull request

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