v3.0.0

Update to @shower/core@3.0.0

• Update shower/cli 47a264d
• Update path to the core 49d4f02
• Swtich to org package f656452
• Update dependencies 2179451
• Add new CI testing badge 981a729
• Add GitHub Action test 2a23bda
• Update dependencies in lock file 3e7d848