v1.9.4

FixedEffectModels v1.9.4

Diff since v1.9.3

Closed issues:

• tolerance in invsym! (#240)

Merged pull requests:

• export dof (#236) (@matthieugomez)
• Update CompatHelper.yml (#238) (@matthieugomez)
• Add loglikelihood and nullloglikelihood (#239) (@junder873)
• fix collinearity + update CUDA (#241) (@matthieugomez)