0.4.0

API Breaking Changes

• The DependencyGraph no longer treats root vertices specially, nor does it
  maintain a direct reference to edges. Additionally, Vertex no longer
  has a reference to its parent graph.

Enhancements

• Resolution has been sped up by 25x in some pathological cases, and in general
  recursive operations on a DependencyGraph or Vertex are now O(n).
  Samuel Giddins
  Bundler#3803
• Re-sorting of dependencies is skipped when the unresolved dependency list has
  not changed, speeding up resolution of fully locked graphs.
  Samuel Giddins