Include README and LICENSE files in Cargo package.

- Include README.md so it is visible on crates.io and docs.rs.
- Include LICENSE so that the package is legal to distribute.

Author: mbrubeck

Cargo.toml

@@ -18,6 +18,8 @@ version = "0.36.0"
 build = "build.rs"
 
 include = [
+  "LICENSE",
+  "README.md",
   "Cargo.toml",
   "build.rs",
   "src/*.rs",