Lock version to supported msm-version

[forslund]

Description

This is a quick fix for #59 msk should be updated accordingly but as the 0.9 version of msm hasn't been adopted quite yet I believe this is the best way to keep it synched with mycroft-core and the msm tool in use.

Type of PR

• [ x ] Bugfix
• Feature implementation
• Refactor of code (without functional changes)
• Documentation improvements
• Test improvements

Testing

Check that a fresh install in a venv works out of the box by running (from the msk folder)

python3 -m venv venv
source venv/bin/activate
pip install .
msk create

and doesn't throw a TypeError

[krisgesling]

Looks good, thanks Ake :)