Bump to 0.1.15

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 
 name = "num"
-version = "0.1.14"
+version = "0.1.15"
 authors = ["The Rust Project Developers"]
 license = "MIT/Apache-2.0"
 homepage = "https://github.com/rust-lang/num"