[fix] debug pgsql service

Author: hemache

.travis.yml

@@ -44,6 +44,7 @@ install:
   - pip install docutils pygments  # for setup.py check -r -s
 
 before_script:
+  - sudo cat /var/lib/postgresql/12/main /var/log/postgresql/postgresql-12-main.log
   - createdb django_restframework_gis
   - psql -U postgres -d django_restframework_gis -c "CREATE EXTENSION postgis;"