* function code
* add tests for regressor coefficients utility
* add documentation for regressor_coefficients util function
* generate Rd docs
* add regressor_coefficients to R namespace
* minor formatting nit
* fix bugs
+ cleans up Stan model compilation by switching over to the rstantools-based workflow (see https://mc-stan.org/rstantools/articles/minimal-rstan-package.html for more info)
+ minor documentation change: {devtools} -> {remotes}, which is better for end-users
+ adds RStudio project file which makes it easier for community to get started with contributing to the package
* Allow both both hoidays and append holidays
Match holidays in predict and fit
Add test for append_holiday features; minor fixes
Add column name validation for append_holidays names; allow only one country
Fix bug about holiday year different from input year and also other bugs
Change function description
Add append holiday feature for R
* Add test for R/Pyrhon; fix bugs
* Add metrics for model validation
* Update to reflect comments on Github
* Change all_metrics() implementation to more sophisticated style
* Update metrics functions
* Remove redundant argument
* Use v0.3 files for diagnostics.R and prophet.R
* Use v0.3 file for man/predict.prophet.Rd
* Change the interface and do some refactoring
