2.1.0 to 3.0.0 (2023-12-21)
  * Fix build failure with ncurses 6.3
  * Add call to PKG_PROG_PKG_CONFIG and pkg-check ncurses libs #46
  * Fix build with musl
  * Add highlighting of user input #56
  * Fix toggling marks removing solution #51

2.0.0 to 2.1.0 (2020-11-20)
  * Use actual terminal background color (instead of black) as background
  color (pr #31)
  * Define minimum gettext version instead of exact one (pr #32)
  * Require gettext 0.20
  * Add Japanese translation (pr #40)
  * Minor code change

1.0.0 to 2.0.0 (2019-07-30)
  * Translation support
  * Added translations for:
    - Spanish
    - German
    - Russian
  * Refactoring and code cleanup
  * Add color difference between provided numbers and the ones entered by the
  user
  * Output sudoku PDFs (-p/-n option)
  * Output sudoku PNG (-i option)
  * Fix duplicate fields in sudoku generation (pr #28)

0.2.5 to 1.0.0 (2018-04-19)
  * Add 'mark' command to highlight the currently selected number in all othre
    cells. Thanks to James Warnock.
  * Redesign commands display.
  * Display how many hints a person used when the puzzle is solved.
  * Update maintainer email and man page.
  * Code cleanup

0.2.4 to 0.2.5 (2016-06-07)
  * Fix manpage warning section-mismatch (issue #5)

0.2.3 to 0.2.4 (2015-08-26)
  * Handle automatic resize requests
  * Document deletion of number (x key)
  * Provide stream example to man page
  * Fix array acces in validity check (issue #4)

0.2.2 to 0.2.3 (2015-08-21)
  * Clean up validity checker
  * Move manpage to its own directory
  * Add manpages to `make dist`
  * Update autoconf files
  * Clean up headers
  * Make local functions static

0.2.1 to 0.2.2 (2015-08-19)
  * Add manpage
  * User can provide sudokus of hiw own (-s option)
  * Major code cleanup
  * Provide hints (H key)
  * Improve feedback fro 'check' with which the user validates his inputs (c
  key)

0.2.0 to 0.2.1 (2015-02-11)
  * Fix autoconf

0.1 to 0.2.0 (2015-02-07)
  * Fix removing of inserted numbers

0.1 (2015-02-03)
  * nudoku is born
