0.4.x

[yann-eugone]

• :warning: Removed support of PHP < 7.1
• :warning: Removed support of Symfony < 4.4
• Updated to PHPUnit 7.* (didn't pick higher because of minimal php version)
• :warning: added PHP strict type on everything

[yann-eugone]

Closing pull request, branch will stay as source for 0.4* versions