Make documentation links relative in README

Change-Id: Ie91ada43e49a4a6c94b4dd610ea84c2ba635c82f

README.md

diff --git a/README.md b/README.md
index a080a40..9fbdd1a 100644
--- a/README.md
+++ b/README.md
@@ -37,8 +37,8 @@
 * [Configuration]
 * [Message Format]
 
-[Configuration]: https://github.com/rinrinne/gerrit-rabbitmq-plugin/blob/master/src/main/resources/Documentation/config.md
-[Message Format]: https://github.com/rinrinne/gerrit-rabbitmq-plugin/blob/master/src/main/resources/Documentation/message.md
+[Configuration]: src/main/resources/Documentation/config.md
+[Message Format]: src/main/resources/Documentation/message.md
 
 Minimum Configuration
 ---------------------