Mentioned Kratos in README
Mentioned Kratos in README

dondieselkopf/amgcl,ddemidov/amgcl,ddemidov/amgcl,ddemidov/amgcl,ddemidov/amgcl,dondieselkopf/amgcl,huahbo/amgcl,huahbo/amgcl,huahbo/amgcl,dondieselkopf/amgcl