Version 2.0.1

Added
- docs: Example for `lp_terminal_format()` (#657, 954bace)
- tests: Tests for tools/theme-preview.sh and
  tools/external-tool-tester.sh (e121179)

Fixed
- general: Unset errors in liquidprompt and theme-preview on
  Bash-3.2 (#656, e121179)
- general: Unset errors in liquidprompt in Zsh when no terminal
  attached (dc11eb4)
- general: Unset errors in liquidprompt on Windows (461f0ee)
- color: Background of path always black, ignoring terminal background
  setting (#657, 58693b0)
- tools: Make theme-preview.sh work in Zsh (e121179)

Changed
- color: `LP_COLOR_PATH` changed to `$NO_COL`, to follow terminal
  default foreground (58693b0)
- color: `LP_COLOR_PATH_SEPARATOR` and 'LP_COLOR_PATH_SHORTENED` changed
  from light grey to grey, to be neutral on both light and dark
  backgrounds (58693b0)
- color: `LP_COLOR_PATH_LAST_DIR` and 'LP_COLOR_PATH_VCS_ROOT` changed
  from bold white to `$BOLD`, to follow terminal default
  foreground (58693b0)

Thanks to:
* Ludovic Rousseau (@LudovicRousseau) for reporting unset crash on
  Bash-3.2, and reporting path color issue on light background
  terminals.