use crates.io in README
use crates.io in README

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