Update list for Puzzletron

Puzzletron 4.0 changelog from September 8, 2010

-Puzzles can be saved as pictures or puzzle files.
-Zooming
-Other minor improvements.

Puzzletron 3.3 changelog from September 21, 2009

-Puzzles can be saved as pictures or puzzle files.
-Zooming
-Minor improvements.

Puzzletron 3.1 changelog from August 9, 2009

Minor Update

Put a free download button on your own website

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