Release build (v2.0.0)

What's Changed

erdtree v2.0.0 introduces numerous breaking changes as well as a plethora of new features. Most breaking changes are predicated on the fact that
arguments were either renamed, removed, or fundamentally modified. The following is a list of all the PRs that document these changes and feature additions:

• Regular expressions #130
• Unix permissions #132
• Force color #135
• Show hardlinks without double counting file size #136
• Regular expressions and globbing with file-type #137
• Truncate output #138
• Inverted tree layout #139

Perhaps the most important change to note is that the compiled binary has been renamed from et to erd in order to address the following issue
regarding name collisions with other programs: #23

For a more comprehensive overview of erdtree v2.0.0, please refer to the README.md.

Full Changelog: v1.8.1...v2.0.0