change to gplv3, change packery license to GPLv3 as well

LICENSE

@@ -1,7 +1,7 @@
 License 
 ~~~~~~~~~~
-zmNinja is GPL 2.0 licensed as of Jul 10, 2021
-See https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html
+zmNinja is GPL 3.0 licensed as of Jul 10, 2021
+See https://www.gnu.org/licenses/gpl-3.0.en.html
 
 Third Party credits
 ===================
@@ -19,18 +19,8 @@ http://soundbible.com/2067-Blop.html
 Version 1.1.0 and above of zmNinja uses Packery.
 http://packery.metafizzy.co
 
-A commercial single developer license has been purchased for the same.
-Note that this license allows me (pliablepixels) to use Packery for commercial
-apps that I develop (such as zmNinja). Given that I publish my source under
-CC BY-NC-SA 4.0, you can compile the code for your personal use (non commercial purposes)
-and continue to use Packery. This is compliant to Packery's license too, where they
-prohibit other developers to build for profit using the license I purchased.
-
-If however you purchase the source code from me, you will
-still have to purchase an additional license for Packery from David via http://packery.metafizzy.co/#commercial-license
-It's very cheap ($25 for unlimited products by one developer).
-
-
+Since I switched to GPL v3, we can continue using Packery under its GPLv3 license as kWarningLargeTimeline
+See https://packery.metafizzy.co/license.html