Release Name: Bug fixes including two random effects (v2.0.1)

Notes:
## What''s Changed
* add sig2mat_perm by @ofrei in https://github.com/cmig-research-group/c...
* simulate ''A'' effect in FEMA_run_on_synthetic_data.m by @ofrei in https://github.com/cmig-research-group/c...
* FEMA_fit fails when RandomEffects has just two elements #2 by @ofrei in https://github.com/cmig-research-group/c...


**Full Changelog**: https://github.com/cmig-research-group/c...