rstudio.prefs 0.1.9

• Fix for use_rstudio_secondary_repo() when it is used to set the first secondary repository. (#14)

• Updated use_rstudio_prefs() and use_rstudio_secondary_repo() to use the {rstudioapi} package to read and write RStudio preferences instead of manually manipulating the preferences JSON file. (#12)

• Corrected the folder location of the app data folder from RStudio to rstudio on Unix. (#11)