v2.0.0

This release breaks backwards compatibility with the previous v1.3.0
release.  The following changes can be found in this release:

— The ‘x’, ‘y’, ‘g’, and ‘v’ operators have been renamed to ‘x’, ‘X’,
  ‘g’, and ‘G’.
— The ‘h’ and ‘H’ operators have been added to highlight text.
— Empty arguments to operators are no longer supported, except for ‘h’.
— ‘X’ (formerly ‘y’) ignores 0-length matches.
— The ‘ma’ color category in GRAB_COLORS has been renamed to ‘hl’.
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