macros: bump to 0.1.37

macros/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "num-macros"
-version = "0.1.38"
+version = "0.1.39"
 authors = ["The Rust Project Developers"]
 license = "MIT/Apache-2.0"
 homepage = "https://github.com/rust-num/num"