Added GB to docs and a shout to @WanderingZombie
Added GB to docs and a shout to @WanderingZombie

Memphis335/holidayapi.com,calvera/holidayapi.com,Memphis335/holidayapi.com,calvera/holidayapi.com,igitur/holidayapi.com,Sazed/holidayapi.com,Sazed/holidayapi.com,igitur/holidayapi.com