Bump PHP to 8.0, add CI, modernize code (#25)

Fix read order in forwarded headers (#22)

Co-authored-by: Deniss Kozlov <deniss.kozlov@dukascopy.com>

Merge pull request #15 from WyriHaximus/patch-1

Fixed package title header

Add Whip::IPVx constants to Whip, and related documentation corrections.

Make constructor able to handle standard header format.

Fix spurious test issue: inet_pton sometimes considers 127.0.0.01 a v…

…alid IP address.

Added docs for private methods and reordered the methods for better l…

…ogical grouping.

PHP 5.3 fix.