Merge pull request #11 from sebastic/license

Use GPL v1 like Perl and PDL.

Author: mohawk2

README.pod

@@ -846,7 +846,7 @@ Craig DeForest, C<< <[email protected]> >>
 Copyright 2013 Craig DeForest
 
 This program is free software; you can redistribute it and/or modify
-it under the terms of either: the Gnu General Public License v2 as
+it under the terms of either: the Gnu General Public License v1 as
 published by the Free Software Foundation; or the Perl Artistic
 License included with the Perl language.
 

lib/PDL/Graphics/Simple.pm

@@ -1567,7 +1567,7 @@ Craig DeForest, C<< <[email protected]> >>
 Copyright 2013 Craig DeForest
 
 This program is free software; you can redistribute it and/or modify
-it under the terms of either: the Gnu General Public License v2 as
+it under the terms of either: the Gnu General Public License v1 as
 published by the Free Software Foundation; or the Perl Artistic
 License included with the Perl language.