Update for newer PHP and dependencies #82
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This PR makes the test suite run (successfully) on PHP 7.3. and 7.4, raises the minimum to PHP 7.3 (the oldest currently supported release), and updates various dependencies for more recent versions, in particular PHPUnit 9 and Guzzle 7.
I tried it on PHP 8.0 but it breaks because there is no compatible version of laminas/laminas-diactoros on 8.0 yet so I left that out of this PR, but at least you know where the problems lie.
If this is merged and tagged, I recommend bumping the major version since these updates amount to a BC break.