Clarify posgres install fix

README.md

@@ -291,9 +291,11 @@ sudo PGUSER=postgres make installcheck # to run tests
 You need to add schema_triggers.so to the shared_preload_libraries setting in postgresql.conf :
 
 ```
-vim /etc/postgresql/9.3/main/postgresql.conf
+$ sudo vim /etc/postgresql/9.3/main/postgresql.conf
 ...
 shared_preload_libraries = 'schema_triggers.so'
+
+$ sudo service postgresql restart # restart postgres
 ```
 
 After this change the 2nd installcheck of cartodb-postresql should be OK.