4.0.0

What's Changed

• Add -mcpu= support to sort.flags_sort_key by @hartwork in #109
• Fix help output link clickability by @hartwork in #111
• Debug print invocation of target help call to GCC, also by @hartwork in #112
• README.rst: Get --help output back in sync by @hartwork in #113
• Start using /dev/stdout by @hartwork in #114
• README.rst: Migrate from reStructuredText to Markdown by @hartwork in #116
• Fix target help parser (fixes #110) by @hartwork in #115
• Bump version to 4.0.0 by @hartwork in #117

Full Changelog: 3.0.0...4.0.0