remove spurious "using SEM"

Alexey Stukalov · alyst · commit e084533baa6f · 2024-04-20T12:52:24.000-07:00
diff --git a/src/observed/covariance.jl b/src/observed/covariance.jl
@@ -45,7 +45,7 @@ struct SemObservedCovariance{B, C, D, O} <: SemObserved
     n_man::D
     n_obs::O
 end
-using StructuralEquationModels
+
 function SemObservedCovariance(;
     specification,
     obs_cov,
