fixed sqlite tests

Author: Kareem Zidane

.travis.yml

@@ -14,7 +14,9 @@ install:
 before_script:
 - mysql -e 'CREATE DATABASE IF NOT EXISTS test;'
 - psql -c 'create database test;' -U postgres
+- touch test.db
 script: python tests/sql.py
+after_script: rm -f test.db
 jobs:
   include:
   - stage: deploy