CR2 0.2.1

• Added a NEWS.md file to track changes to the package.
• Added col/row names to the robust variance/covariance matrix
• Adjusted the “meat” matrix so computations would still run even if only the intercept is used as a predictor (a null model)
• Added tidy methods so CR2 objects can be used with other packages such as modelsummary or gtsummary
• As of 2023.01.03