Cannot install plugins for Moodle 3.10 or 3.11

[PhilippImhof]

Currently, the plugin version is calculated by dividing the Moodle version by 10. This is wrong for versions like 3.10 or 3.11:

$ mdk create --version 310 --install --engine mysqli --run dev
$ mdk plugin install qbehaviour_adaptivemultipart stable_310

Retrieving information for plugin qbehaviour_adaptivemultipart and branch 31.0
No result found
Retrieving information for plugin qbehaviour_adaptivemultipart and branch 30.9
No result found
Could not find a file for this plugin

PR #212 proposes a fix.

[FMCorz]

Fixed in #212.