added necessary step to composer installation

[t-schroeder]

until there is a stable version of phpcompatibility that we can require

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[t-schroeder]

See moodlehq/moodle-cs#79

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[stronk7]

Thanks @t-schroeder ,

makes sense and matches what is already documented @ moodle-cs, so LGTM.

[stronk7]

OT, it's really curious that I've tried here installing it, both globally and in a temp dir... I've not got the "minimum-stability" set (neither globally, neither in the composer.json file itself).

There is some detail that I must be missing... anyway, let's hope a new release happens soon.

Ciao :-)