Bug fixes

Hello everyone!
Thank you for using A/B Test JS!
On this new version contains:

• Restyling buttons;
• Clear code;
• Post-installation information message;
• Validates whether the module tables exist at the time of installation;

Compatibility release for Drupal 8.7.x.

Issues resolved:

• SectionStorageInterface::setSectionList() has been removed

Backwards compatibility has been maintained for previous versions of Drupal 8.

Adding support for url as well.

Fixing minor bugs.

- revamp git repository
- fix incorrect position of send sms in admin page
- add mocean medium