Update CONTRIBUTING.md

CONTRIBUTING.md

@@ -5,8 +5,8 @@
 Small typos or grammatical errors in documentation may be edited directly using
 the GitHub web interface, so long as the changes are made in the _source_ file.
 
-*  YES: you edit a roxygen comment in a `.R` file below `R/`.
-*  NO: you edit an `.Rd` file below `man/`.
+*  DO: edit a roxygen comment in a `.R` file below `R/`.
+*  DON'T: edit an `.Rd` file below `man/`.
 
 ### Prerequisites
 
@@ -18,12 +18,13 @@ bug, create an associated issue and illustrate the bug with a minimal
 ### Pull request process
 
 *  We recommend that you create a Git branch for each pull request (PR).  
-*  Look at the Travis and CodeCovr build status before and after making changes.
+*  Look at the GitHub actions and CodeCovr build status before and after making changes.
 *  We follow [Google's R style guide](https://google.github.io/styleguide/Rguide.html)
 *  We use camelCase for variable names, and TitleCase for function names.
 *  We use the Oxford ending of 'ize' (not 'ise'), and UK spelling (e.g. 'colour') 
    where it is not possible to avoid the distinction (e.g. by shortening to 'col')
-*  We use [roxygen2](https://cran.r-project.org/package=roxygen2).  
+*  We use [roxygen2](https://cran.r-project.org/package=roxygen2) to build
+documentation.  
 *  We use [testthat](https://cran.r-project.org/package=testthat). Contributions
 with test cases included are easier to accept.  
 *  For user-facing changes, add a bullet to the top of `NEWS.md` below the
@@ -36,12 +37,12 @@ Please note that the project is released with a
 [Contributor Code of Conduct](CODE_OF_CONDUCT.md). By contributing to this
 project you agree to abide by its terms.
 
-### Prefer to Email? 
+### Prefer to e-mail? 
 
-Email the person listed as maintainer in the `DESCRIPTION` file of this repo.
-
-Though note that private discussions over email don't help others - of course email is totally warranted if it's a sensitive problem of any kind.
+E-mail the person listed as maintainer in the `DESCRIPTION` file of this repo.
+Private discussions over email don't help others - but of course email is 
+totally warranted for any sensitive problems.
 
 ### Thanks for contributing!
 
-This contributing guide is adapted from the tidyverse contributing guide available at https://raw.githubusercontent.com/r-lib/usethis/master/inst/templates/tidy-contributing.md 
+This document is adapted from the [tidyverse contributing guide](https://raw.githubusercontent.com/r-lib/usethis/master/inst/templates/tidy-contributing.md).