adding php8-support

adds php8-support and drops php5.x-support, pushing min requirement to php7.2 (with work from @stefanvandekaa)

belated php7.4 support

v0.5.5

bump version to 0.5.5

fixed the 0.5.3 f*ckups and introduced support for 7.4, again

The 0.5.3 release has been broken as I did not pay attention that the master was way off of the last release.

• 2020-01-19: added 7.4 support to travis and removed antique php versions (@phy25)
• 2020-01-19: fixed wrong array access in lib_luma
• 2020-01-19: removed HHVM profile from travis. HHVM support is now broken anyway

v0.5.2

this release backports #14

v0.5.1

This release is based on leafo/lessphp v0.5.0
It adds php7-compatibility and includes some of the pull requests for the original leafo/lessphp-repository

These are:
leafo#523
leafo#540
leafo#564
leafo#566
leafo#578
leafo#584
leafo#590
leafo#592
leafo#601
leafo#603
leafo#604
leafo#605
leafo#607
leafo#610
leafo#616
leafo#619

v0.4.1

v0.4.0 with added php7-compatibility