Added a bit more information about running the tests.

test_data/test_schema.sql

@@ -4,8 +4,10 @@
 -- so that the test for connecting as the 'current user' succeeds
 --
 -- the following lines must be added to pg_hba.conf for all tests to
--- succeed:
+-- succeed, with $USER replaced by your username, or the user you will
+-- run the tests with.
 --
+-- host    epgsql_test_db1 $USER                   127.0.0.1/32    trust
 -- host    epgsql_test_db1 epgsql_test             127.0.0.1/32    trust
 -- host    epgsql_test_db1 epgsql_test_md5         127.0.0.1/32    md5
 -- host    epgsql_test_db1 epgsql_test_cleartext   127.0.0.1/32    password