Document use of Sequel.extension :blank with :allow_blank
Document use of Sequel.extension :blank with :allow_blank

nicohvi/sequel,pfarrell/sequel,nju520/sequel,offshore-safety/sequel,reubano/sequel,offshore-safety/sequel,nicohvi/sequel,seeARMS/sequel,yazshel/sequel,beni55/sequel,beni55/sequel,davidbegin/sequel,gferguson-gd/sequel,pfarrell/sequel,mpalmer/sequel,t-morgan/sequel,gferguson-gd/sequel,knut2/sequel,uhoh-itsmaciek/sequel,mpalmer/sequel,uhoh-itsmaciek/sequel,nju520/sequel,yazshel/sequel,reubano/sequel,davidbegin/sequel,seeARMS/sequel,t-morgan/sequel,Marketcircle/sequel,knut2/sequel,offshore-safety/sequel