Fixing quote escaping

.travis.yml

@@ -10,7 +10,7 @@ before_install:
   - sudo apt install mariadb-client mariadb-server mariadb-common libmariadb-dev libmariadb3
   - mysql --version
   - sudo mariadb-upgrade
-  - sudo sed -i '/\[mysqld\]/ a default_time_zone=\'+1:00\'\nevent_scheduler=ON\nuserstat=1\nperformance_schema=ON' /etc/mysql/mariadb.conf.d/50-server.cnf
+  - sudo sed -i '/\[mysqld\]/ a default_time_zone='"'"'+1:00'"'"'\nevent_scheduler=ON\nuserstat=1\nperformance_schema=ON' /etc/mysql/mariadb.conf.d/50-server.cnf
   - sudo systemctl restart mariadb
   - python --version
 install: