Bump VERSION to 1.0.21
Bump VERSION to 1.0.21

grafjo/ubuntu,boxcutter/ubuntu,falconlulu/ubuntu,njohns-grovo/ubuntu,jrosengren/ubuntu,NERC-CEH/ubuntu,kontrafiktion/ubuntu,tbfisher/packer-ubuntu,samepage-labs/ubuntu,quarkslab/ubuntu,samepage-labs/ubuntu,kontrafiktion/ubuntu,kenhkan/packer-templates,jpsecher/ubuntu,quarkslab/packer-ubuntu,defn/basebox-ubuntu,flandr/ubuntu,erikh/ubuntu,boxcutter/ubuntu,erikh/ubuntu,kenhkan/packer-templates,muratayusuke/ubuntu,dragon788/ubuntu,grafjo/ubuntu,falconlulu/ubuntu,tbfisher/packer-ubuntu,njohns-grovo/ubuntu,jrosengren/ubuntu,quarkslab/ubuntu,muratayusuke/ubuntu,NERC-CEH/ubuntu,dragon788/ubuntu,jpsecher/ubuntu,flandr/ubuntu,quarkslab/packer-ubuntu