Fix the sentence about Licenses

Author: titsuki

README.md

@@ -96,6 +96,6 @@ COPYRIGHT AND LICENSE
 
 Copyright 2016 titsuki
 
-libmecab ( http://taku910.github.io/mecab/ ) by Taku Kudo is licensed under the GPL/LGPL/BSD License.
+libmecab ( http://taku910.github.io/mecab/ ) by Taku Kudo is licensed under the GPL, LGPL or BSD Licenses.
 
 This library is free software; you can redistribute it and/or modify it under the Artistic License 2.0.

lib/MeCab.pm6

@@ -149,7 +149,7 @@ titsuki <titsuki@cpan.org>
 
 Copyright 2016 titsuki
 
-libmecab ( http://taku910.github.io/mecab/ ) by Taku Kudo is licensed under the GPL/LGPL/BSD License.
+libmecab ( http://taku910.github.io/mecab/ ) by Taku Kudo is licensed under the GPL, LGPL or BSD Licenses.
 
 This library is free software; you can redistribute it and/or modify it under the Artistic License 2.0.