Changes in version 0.2.0                        

Bug fixes

  - Fixed bug in estimate_rt() where date_end was calculated incorrectly
  - Fixed bug in plot_lag() where renamed data frame was not used
  - Fixed type checking in rolling_corr() to use inherits() instead of
    class()
  - Replaced deprecated summarise_at() with modern summarise() in
    calc_percent_change()

New features

  - Added pkgdown website at https://mrc-ide.github.io/pika/
  - Added GitHub Actions workflows for R-CMD-check and pkgdown
    deployment

Documentation

  - Completely rewrote README with comprehensive usage examples
  - Added citation to the associated Wellcome Open Research paper
  - Fixed vignette index entry title
  - Added URL and BugReports fields to DESCRIPTION

Testing

  - Added comprehensive test coverage for all functions
  - Added happy path tests for cross_corr(), rolling_corr(),
    estimate_rt(), calc_percent_change()
  - Added tests for plot_lag() (previously untested)
  - Added tests for plot_corr() with confidence bands and customization
    options

                        Changes in version 0.1.1                        

  - Added a NEWS.md file to track changes to the package.
  - Added calc_percent_change() to calculate the percent change in a
    time series relative to a baseline period