0.8.1

This is mainly a bug fix release: filenames containing spaces were causing crashes due to a regression in 0.8.0. It also includes a fix for the delta file_a file_b "diff mode" usage style, and an improvement for the diff-highlight / diff-so-fancy emulation modes.

• [closed] 🐛 Panic with filename "01g - Text" #639
• [closed] 🐛 side-by-side option only works in diff mode when piping #631
• [closed] commit-style raw for diff-so-fancy / diff-highlight #623