New features:
  - Added `commit` option for fine-grained version control
  - Fixed issues with parallel installer on Windows and enabled it by default

Improvements:
  - Changed `PlugSnapshot` to create Vim script using the new commit hash support
  - `PlugDiff` shows pending updates for plugins locked on `commit` or `tag`
  - Enhanced output format of post-update hooks

Issues resolved:
  - Fixed Ruby installer to unshallowed tagged plugin on update (#350)
  - Fixed output format of Neovim installer (#340)
  - Remapped `q` in plug window to `bd` (#336)
  - Fixed freeze in Python installer (#318)
  - Case-sensitive validation of `on` arguments (#314)
  - Fixed post-update hook not to run on error
  - Fixed `for` option to load syntax files (#272)
  - Fixed UnicodeDecodeError from Python installer (#262)
  - `set nomodifiable` on commit preview window (#255)
