travis: move setting RUN_TESTS into before_script

.travis.yml

@@ -58,15 +58,15 @@ install:
   # Install from wheelhouse.
   - pip install psycopg2 tox $REQ
   - pip freeze
-before_script:
-  - which pep8 || psql -c 'create database autocomplete_light_test;' -U postgres
 before_install:
   - "export DISPLAY=:99.0"
   - "sh -e /etc/init.d/xvfb start"
-script:
+before_script:
+  - which pep8 || psql -c 'create database autocomplete_light_test;' -U postgres
   - RUN_TESTS="tox -- autocomplete_light --ds=test_project.settings_postgres"
   # Run tests either with or without coverage (being installed).
   - command -v coveralls && RUN_TESTS="$RUN_TESTS --cov" || true
+script:
   # Run pep8 or the tests.
   - which pep8 && { pep8 --exclude=example_apps,tests,migrations --ignore=E124,E128 autocomplete_light; return $?; } || travis_retry $RUN_TESTS
 after_success: