v6.0.0

• Add nginx config for Elgg sites (#616) @hypeJunction
• Add https link to docs The safer, the better (#613) @m1guelpf
• add Symfony4 nginx configuration (#600) @michaelesmith
• ✨ 💡 Make sure not use the Code subfolder in vagrant, should use top level (#601) @svpernova09
• ✨ ❄️ 💡 Add support for multiple versions of PHP (#621) @svpernova09