message: chore: Update changelog.
  Original commit:
diff: +# Enso 2.0.0-alpha.7 (2021-06-06)
  +
  +#### Visual Environment
  +
  +<br/>![Bug Fixes](/docs/assets/tags/bug_fixes.svg)
  +
  +- [Fix node selection bug ][1664]. Fix nodes not being deselected correctly in
  + some circumstances. This would lead to nodes moving too fast when dragged
  + [1650] or the internal state of the project being inconsistent [1626].
  +
  # Enso 2.0.0-alpha.6 (2021-06-28)
  <br/>![New Features](/docs/assets/tags/new_features.svg)
  undo last action and <kbd>cmd</kbd>+<kbd>z</kbd> to redo last undone action.
  This version of undo redo does not have proper support for text editor and
  undoing UI changes (like selecting nodes).
  -- [Fox node selection bug ][1664]. Fix nodes not being deselected correctly in
  - some circumstances. This would lead to nodes moving too fast when dragged
  - [1650] or the internal state of the project being inconsistent [1626].
  #### EnsoGL (rendering engine)
  