Update NOTICE.txt

NOTICE.txt

@@ -1,4 +1,9 @@
 Mattermost Platform Preview 
 Copyright 2015 SpinPunch, Inc. 
 
-Regular expression support is provided by the PCRE library package, which is open source software, written by Philip Hazel, and copyright by the University of Cambridge, England. The original software is available from      ftp://ftp.csx.cam.ac.uk/pub/software/programming/pcre/
+This product contains a modified portion of 'draw2d', a Go library to draw 2d geometrical forms on images by Laurent Le Goff
+
+* LICENSE: 
+  * http://opensource.org/licenses/BSD-3-Clause (BSD 3-Clause)
+* HOMEPAGE: 
+  * https://code.google.com/p/draw2d/