adds section header for specifying algo as discussed in https://github.com/dwyl/hapi-auth-jwt2/issues/59
adds section header for specifying algo as discussed in https://github.com/dwyl/hapi-auth-jwt2/issues/59

martinj/hapi-auth-jwt2,alanshaw/hapi-auth-jwt2,blissbooker/hapi-auth-jwt2,manonthemat/hapi-auth-jwt2,Kryz/hapi-auth-jwt2,ngonzalvez/hapi-auth-jwt2,dwyl/hapi-auth-jwt2,eventhough/hapi-auth-jwt2