0.4.0

• Change the upgrade process to modify the Gemfile.lock in place, with the
  option to "undo" (i.e. restore from backup) if the changes are not desired.
  This makes bundleup much faster since it doesn't have to run bundle update
  twice.
• Fixed a bug where color was mistakenly based on the newest version of a gem,
  even if a restriction prevented upgrading to that version.

0.3.0

• Always show SHA changes in red. If a dependency is tracking a
  Git branch, and running bundle update would cause that branch
  to updated and point to a new ref, that is something that
  warrants attention.

0.2.0

• Animated spinner during long-running bundler commands
• Rather than run bundle in a temp directory, run within the current
  directory, making a backup copy of Gemfile.lock. This ensures that relative
  paths and .bundle/config are honored.

0.1.0

• Initial release