[WIP] Support legacy PHP 5.3 #48
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Here's a small update to add support for legacy PHP 5.3 which I've looked into a while back. This PR shows how this requires only smaller changes in the code and mostly boils down to locking some (outdated) dependencies. In particular, this means this would need to downgrade react/promise to v1.x and as such means that we can not take advantage of the recent very significant memory and performance improvements in v2.6/v2.7. Because of this, I'm mostly filing this for the reference and do not plan to merge this any time soon. Also, I don't see a particular demand for legacy PHP versions anymore, so I'll just leave this here for now.