add various fields to Cargo.toml

Author: nikomatsakis

Cargo.toml

@@ -1,6 +1,10 @@
 [package]
 name = "rustc-hash"
 version = "0.1.0"
-authors = ["Niko Matsakis <[email protected]>"]
+authors = ["The Rust Project Developers"]
+description = "speed, non-cryptographic hash used in rustc"
+license = "Apache-2.0/MIT"
+readme = "README.md"
+keywords = ["hash", "fxhash", "rustc"]
 
 [dependencies]