Improve backwards compatibility with Promise v1 #125
Merged
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This adds support for legacy Promise v1 (while keeping support for newer versions). This is an internal change only and does not affect our API. This helps bringing this component more in line with the react/http component (see also reactphp/http#101 and #78). This also effectively reverts #31, but this is a safe operation because throwing from an event handler is forbidden as of reactphp/stream#101 anyway.