v0.9.0

• Click a file in the list or the tree of changed files: its diff opens in a third column next to the
  list, colored like the editor. Drag the divider to resize it (remembered); ✕ closes it.
  Double-click the file, or its icon on hover, to open the diff in the editor instead
• Easier to read in light themes: hashes and links use the theme's link color, secondary text is no
  longer dimmed twice, and line numbers in diffs use the editor's line number color