nipnTK v0.1.1.9000

Second release of nipnTK. This is a GitHub-only development release. In this release:

General updates

• remove appveyor.yml and the Appveyor ci/cd workflow

• update GitHub Actions workflow to latest 5 system standard check

• update GitHub Actions workflow for coverage testing

• change default git branch name from master to main

• add CITATION

• update CONTRIBUTOR guidelines

• upgrade website to bootstrap 5

• edit typo in vignette

What's Changed

• create devel version by @ernestguevarra in #37
• update docs/ outputs and favicons by @ernestguevarra in #40
• update general; re-roxygenate by @ernestguevarra in #45
• update repo; fix #46; fix #47; fix #48 by @ernestguevarra in #49
• edit typo in vignette; fix # 42 by @ernestguevarra in #50

Full Changelog: v0.1.0...v0.1.1.9000