New version: MatrixLM v0.3.1

[JuliaRegistrator]

• Registering package: MatrixLM
• Repository: https://github.com/senresearch/MatrixLM.jl
• Created by: @GregFa
• Version: v0.3.1
• Commit: 031a7893009d8588cca7f52015749f05d3eb610f
• Reviewed by: @GregFa
• Reference: senresearch/MatrixLM.jl@031a789#commitcomment-176531463
• Description: Core functions to obtain closed-form least squares estimates for matrix linear models.
• Release notes:

- Updated license
- Added a summary function
- Increased test coverage

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