Remove the word "it" from README & CONTRIBUTING

It was accidentally left in from a previous draft of the license
grant.

CONTRIBUTING

@@ -80,7 +80,7 @@ they're ready. Updates to release branches are made as needed.
 Licensing
 ---------
 
-You can redistribute it and/or modify this file under the terms of the
+You can redistribute and/or modify this file under the terms of the
 GNU General Public License as published by the Free Software
 Foundation, either version 3 of the License, or (at your option) any
 later version.

README

@@ -18,7 +18,7 @@ CONTRIBUTING file for more information.
 Licensing
 ---------
 
-You can redistribute it and/or modify this file under the terms of 
-the GNU General Public License as published by the Free Software 
-Foundation, either version 3 of the License, or (at your option) any 
+You can redistribute and/or modify this file under the terms of the
+GNU General Public License as published by the Free Software
+Foundation, either version 3 of the License, or (at your option) any
 later version.