use standard formulation of GPL

COPYING.md

@@ -1,11 +1,10 @@
 This package is released under the 
-[GPL V3](https://www.gnu.org/licenses/gpl-3.0.html),
+[GPL V3 license](https://www.gnu.org/licenses/gpl-3.0.html),
 all files contain the disclaimer:
 
     This program is free software; you may redistribute and/or modify it under
     the terms of the GNU General Public License as published by the Free 
-    Software Foundation, either version 2 of the License, or (at your option)
-    any later version.
+    Software Foundation, either version 2, or at your option any later version.
 
     This program is distributed in the hope that it will be useful, but
     WITHOUT ANY WARRANTY, without even the implied warranty of MERCHANTABILITY

License.txt

@@ -631,8 +631,8 @@ to attach them to the start of each source file to most effectively
 state the exclusion of warranty; and each file should have at least
 the "copyright" line and a pointer to where the full notice is found.
 
-    {one line to give the program's name and a brief idea of what it does.}
-    Copyright (C) {year}  {name of author}
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
 
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
@@ -652,7 +652,7 @@ Also add information on how to contact you by electronic and paper mail.
   If the program does terminal interaction, make it output a short
 notice like this when it starts in an interactive mode:
 
-    {project}  Copyright (C) {year}  {fullname}
+    <program>  Copyright (C) <year>  <name of author>
     This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
     This is free software, and you are welcome to redistribute it
     under certain conditions; type `show c' for details.