Add the no-std crate category

Author: cuviper

Cargo.toml

@@ -4,7 +4,7 @@ description = "Integer traits and functions"
 documentation = "https://docs.rs/num-integer"
 homepage = "https://github.com/rust-num/num-integer"
 keywords = ["mathematics", "numerics"]
-categories = [ "algorithms", "science" ]
+categories = ["algorithms", "science", "no-std"]
 license = "MIT/Apache-2.0"
 repository = "https://github.com/rust-num/num-integer"
 name = "num-integer"