prettyPanelMatch 0.2.0

• Added pretty_placebo_test() and gg_placebo_test() for tidying and plotting placebo_test() results from the PanelMatch package.
• Added pretty_covariate_balance() and gg_covariate_balance() for tidying and plotting get_covariate_balance() matrices as faceted grids (models as rows, matching stages as columns).
• Added autoplot() methods for ppm_placebo_tidy and ppm_cov_tidy classes.
• Added roxygen2-generated man pages for all exported functions.
• Updated package-level documentation to describe all three function families.

prettyPanelMatch 0.1.0

• Initial release.
• tidy_panel_estimate() converts PanelEstimate summaries into tidy data frames.
• ggplot_panel_estimate() creates coefficient plots with significance-coded shapes.
• autoplot() method for ppm_tidy class.