Update list for Sudoku for Windows

Sudoku for Windows 1.7.20.001 changelog from November 18, 2010

Add some more prompt message.

Sudoku for Windows 1.7.10.060 changelog from September 28, 2009

Code optimalization.

Sudoku for Windows 1.7.10.059 changelog from June 12, 2009

Add some more prompt message.

Older Sudoku for Windows versions:

• 1.7.20.001 (Nov 18, 2010) • 1.7.10.060 (Sep 28, 2009) • 1.7.10.059 (Jun 12, 2009) • 1.7.10.056 (Mar 25, 2009) • 1.7.10.048 (Mar 4, 2009) • 1.7.10.047 (Feb 10, 2009) • 1.7.10.044 (Jan 17, 2009) • 1.7.10.041 (Dec 20, 2008) • 1.7.10.037 (Sep 20, 2008) • 1.7.10.034 (Sep 1, 2008) • 1.7.10.032 (Aug 12, 2008) • 1.7.10.028 (Jul 15, 2008) • 1.7.10.025 (Jun 12, 2008) •