Compatibility issue since version 1.14.0 about message

[stefangr]

This is caused by

        "psr/http-message": "^1.0 || ^2.0"

Version ^1.0 of this package doesn't have type hints in the interfaces.
Version ^2.0 does and that requires the implementing classes to do the same.

Version 1.13 of this package had a requirement of:

        "psr/http-message": "^1.0"

so it's strange that the requirement was extended without updating the code.

[dbu]

dang, our CI had been tricked by other dependencies still restricting http-message to ^1.0, so we did not actually test the code with 2.0. i will try to adjust the code asap. looks like meanwhile the other dependencies no longer restrict http-message to ^1.0

meanwhile the hotfix is to restrict your application to psr/http-message: ^1.0 until we release a fix.