1.26.x

Some highlights:

• Pants now uses Pex 2.1, which uses Pip instead of its own custom resolver. See https://github.com/pantsbuild/pex/pull/788 for details.
• Adds support for pants.toml as an improvement on the now legacy pants.ini format. See https://groups.google.com/forum/#!topic/pants-devel/N1H03oJONco for details.
• Adds support for Python lockfiles.
• Adds the Pylint linter.
• Adds IPython support to <<pantscmd>> repl.
• Adds support for getting coverage data with <<pantscmd>> test.
• When using file arguments with <<pantscmd>> test, fmt, or lint, Pants now runs over only the files specified, rather than all files belonging to the owning target.
• Changes <<pantscmd>> fmt and <<pantscmd>> lint to batch targets together for better performance, at the cost of less fine-grained caching. This can be disabled with --fmt-per-target-caching and --lint-per-target-caching.

See here for a detailed change log.