Fixed

• Fix .travis.yml #561

Added

• RfC add all missing CPU Architectures form ubuntu #567

Docs

• Fix Docker registry URL #553
• Update ubuntu version in readme #575
• Image uses 20.04 now #570
• Add instructions to install "vagrant-disksize" plug-in #581
• Update ubuntu version in readme #575

Changed

• Upgrade to Ubuntu Focal (20.04) #555
• Update Vagrantfile to bring Ubuntu 20.04 (Focal Fossa) #582