Merge pull request IlyaGrebnov#6 from alexey-milovidov/patch-1

Patent on Sort Transform has been expired

README

@@ -73,9 +73,9 @@ http://msdn.microsoft.com/en-us/windows/hardware/gg487368.aspx#E2
 Sort Transform:
 ---------------
 
-Sort Transform is patented by Michael Schindler under US patent 6,199,064.
-However for research purposes this algorithm is included in this software.
-So if you are of the type who should worry about this (making money) worry away.
+Sort Transform was patented by Michael Schindler under US patent 6,199,064.
+As of 2020, patent has expired and no longer active.
+
 The author shall have no liability with respect to the infringement of
 copyrights, trade secrets or any patents by this software. In no event will
 the author be liable for any lost revenue or profits or other special,