NEWS xref

Author: palday

NEWS.md

@@ -673,5 +673,8 @@ Package dependencies
 [#840]: https://github.com/JuliaStats/MixedModels.jl/issues/840
 [#841]: https://github.com/JuliaStats/MixedModels.jl/issues/841
 [#842]: https://github.com/JuliaStats/MixedModels.jl/issues/842
+[#849]: https://github.com/JuliaStats/MixedModels.jl/issues/849
 [#850]: https://github.com/JuliaStats/MixedModels.jl/issues/850
 [#853]: https://github.com/JuliaStats/MixedModels.jl/issues/853
+[#854]: https://github.com/JuliaStats/MixedModels.jl/issues/854
+[#856]: https://github.com/JuliaStats/MixedModels.jl/issues/856