[ Chris Lamb ]
* Fix the semantic comparison of R's .rdb files after a refactoring of
  temporary directory handling in a previous version.
* Support a newer format version of R's .rds files.
* Update tests for OCaml 4.12. (Closes: reproducible-builds/diffoscope#274)
* Move diffoscope.versions to diffoscope.tests.utils.versions.
* Use assert_diff in tests/comparators/test_rdata.py.
* Reformat various modules with Black.

[ Zbigniew Jędrzejewski-Szmek ]
* Stop using the deprecated distutils module by adding a version
  comparison class based on the RPM version rules.
* Update invocations of llvm-objdump for the latest version of LLVM.
* Adjust a test with one-byte text file for file(1) version 5.40.
* Improve the parsing of the version of OpenSSH.

[ Benjamin Peterson ]
* Add a --diff-context option to control the unified diff context size.
  (reproducible-builds/diffoscope!88)