message: Update Vagrant image
diff: # vi: set ft=ruby :
  Vagrant.configure("2") do |config|
  - config.vm.box = "docs.rs"
  - config.vm.box_url = "https://docs.rs/vagrant.box"
  - config.vm.box_download_checksum = "02554eb16ac72367980a883c4ff05f17d9988406"
  - config.vm.box_download_checksum_type = "sha1"
  + config.vm.box = "docs.rs_v2"
  + config.vm.box_url = "https://docs.rs/vagrant_v2.box"
  + config.vm.box_download_checksum = "7c6d9ef85a55461bce361e9734baf54a6eea9affa2334480cd7613a9a6b62bc4"
  + config.vm.box_download_checksum_type = "sha256"
  config.ssh.username = "cratesfyi"
  