v1.2.0 – Grav 2 & Admin2

1. • Grav 2 and Admin2 compatibility (tested on Grav 2.2.10 + Admin2 2.1.35 / API 1.0.51 and Grav 1.7.53.5 + Admin 1.10.60)
   • Declares compatibility: grav: ['1.7', '2.0'] so the Grav 2 upgrade preflight and GPM no longer flag the plugin as Grav 1.7 only
   • fb_conversion_event() allowed in sandboxed page content on Grav 2 (onBuildTwigSandboxPolicy)
2. • Visitor IP resolved with Uri::ip(), honouring the system.http_x_forwarded.* proxy settings
   • Minimum Grav version raised to 1.7.0
   • README: Grav 2 / Admin2 section, Twig in page content example