exclude CI files from the package

Author: cuviper

Cargo.toml

@@ -11,6 +11,7 @@ repository = "https://github.com/rust-num/num-derive"
 version = "0.2.4"
 readme = "README.md"
 build = "build.rs"
+exclude = ["/ci/*", "/.travis.yml", "/bors.toml"]
 
 [dependencies]
 proc-macro2 = "0.4.2"