fix another link to koha-community.org

Signed-off-by: Galen Charlton <gmcharlt@gmail.com>

Author: gmcharlt

INSTALL

@@ -5,7 +5,7 @@ Koha is the first open-source Integrated Library System. Developed initially in
 New Zealand by Katipo Communications, Ltd and first deployed in January of 2000
 for the Horowhenua Library Trust, it is currently maintained by a team of
 software providers and library technology staff from around the globe. Learn
-more about the Koha project at http://koha.org.
+more about the Koha project at http://koha-community.org.
 
 INSTALLATION
 ============