Sloc v2.2.0

What's Changed

• Split C/C++ and add new languages, document supported languages by @coldhighsun in #35
• feat(core): analyze a git commit/tree-ish directly via --git-hash by @coldhighsun in #36
• fix(cli): correct progress label when gitignore/gitattributes checks disabled by @coldhighsun in #37

Full Changelog: v2.1.0...v2.2.0