Update links

git-svn-id: https://svn.calendarserver.org/repository/calendarserver/PyKerberos/trunk@15530 e27351fd-9f3e-4f54-a53b-843176b1656c

CONTRIBUTING.md

@@ -1,6 +1,6 @@
 By submitting a request, you represent that you have the right to license
 your contribution to Apple and the community, and agree that your
-contributions are licensed under the Apache License Version 2.0.
+contributions are licensed under the [Apache License Version 2.0](LICENSE.txt).
 
 For existing files modified by your request, you represent that you have
 retained any existing copyright notices and licensing terms. For each new
@@ -10,4 +10,4 @@ Calendar and Contacts Server's licensing terms.
 
 Before submitting the request, please make sure that your request follows
 the [Calendar and Contacts Server's guidelines for contributing
-code](https://github.com/apple/ccs-calendarserver/HACKING.rst).
+code](../../../ccs-calendarserver/blob/master/HACKING.rst).