ropensci/targets: {paws} options and tar_source()

targets 0.13.0 Bug fixes Do not bootstrap the junction of a stem unless the target is branched over (#858, @dipterix). For non-"file" AWS targets, immediately delete the scratch file after the target is uploaded (#889, @stuvet). New features Allow extra arguments to paws functions via ... in tar_resources_aws() (#855, @michkam89). Add tar_source() to conveniently source R scripts (e.g. in _targets.R). Enhancements Color ordinary targets messages the default theme color, and color warnings and errors red (#856, @gorkang). Automatically supply job names in the scripts generated by use_targets(). Inherit resources one-by-one in nested fashion from tar_option_get("resources") (#892). See the revised "Resources" section of the tar_resources() help file for details