withr v2.1.1

• Fixes testthat 2.0.0 failures
• with_file() function to automatically remove files.

withr v2.1.0

• with_connection() function to automatically close R file connections.

• with_db_connection() function to automatically disconnect from DBI database
  connections.

• with_gctorture2 command to run code with gctorture2, useful for testing
  (#47).

• with_package(), with_namespace() and with_environment() (and equivalent
  locals) functions added, to run code with a modified object search path (#38,
  #48).

• Add with_tempfile() and local_tempfile() functions to create temporary
  files which are cleanup up afterwards. (#32)

• Remove the code argument from local_ functions (#50).

2.0.0

• Each with_ function now has a local_ variant, which reset at the end of
  their local scope, generally at the end of the function body.

• New functions with_seed() and with_preserve_seed() for running code with
  a given random seed (#45, @krlmlr).

withr 1.0.1

• Relaxed R version requirement to 3.0.2 (#35, #39).
• New with_output_sink() and with_message_sink() (#24).