Merge pull request #100 from fluser/remove-unsupported-debian-jessie

Quote from i-MSCP Github (1.5.3)

Code

1. Merge pull request #100 from fluser/remove-unsupported-debian-jessie
3. Remove Debian jessie (EOL)

Source: https://github.com/i-MSCP/imsc…c4b97d0db6ed3ea865df72b36