fix deperecation warning
fix deperecation warning

rust-lang/num,Emerentius/num,rust-num/num-bigint,koverstreet/num,rust-num/num,DonSheddow/num,rust-lang/num,tomaka/num,rust-num/num-traits,huonw/num,achanda/num,anchovieshat/num,jbcrail/num,Ticki/num,hauleth/num,achanda/num,koverstreet/num,DonSheddow/num,rust-num/num-traits,rust-num/num,rust-num/num-integer,anchovieshat/num,rust-num/num-bigint,jbcrail/num,jdm/num,ollie27/rust_num,bluss/num,vks/num,Gustorn/num,rust-num/num-integer,vks/num