Docs build errors

[simmsa]

Building the mhkit documentation errors:

WARNING: [sphinxcontrib-matlabdomain] Unexpected class attribute: 'TestTags'.  In 'mhkit.tests.Loads_TestExtreme'.
WARNING: [sphinxcontrib-matlabdomain] Unexpected class attribute: 'TestTags'.  In 'mhkit.tests.Loads_TestLoads'.

Do we need these?

[simmsa]

This was fixed here: simmsa@7c282c6 here: 40a4ef0 and will be included in the upcoming v0.6.0 release