Try using travis user for postgres

Author: palfrey

.travis.yml

@@ -26,8 +26,8 @@ env:
     - ODBC_SYS_STATIC_PATH=/usr/lib/x86_64-linux-gnu/
     - POSTGRES_SERVER=localhost
     - POSTGRES_PORT=5432
-    - POSTGRES_USERNAME=postgres
-    - POSTGRES_PASSWORD=postgres
+    - POSTGRES_USERNAME=travis
+    - POSTGRES_PASSWORD=travis
     - RUST_BACKTRACE=1
     - POSTGRES_DRIVER=/usr/lib/x86_64-linux-gnu/odbc/psqlodbca.so
     - SQLITE_DRIVER=/usr/lib/x86_64-linux-gnu/odbc/libsqlite3odbc.so