Update metadata

Author: matthew-a-thomas

Cargo.toml

@@ -3,6 +3,8 @@ name = "ansi_rgb"
 version = "0.1.0"
 authors = ["Matt Thomas <[email protected]>"]
 edition = "2018"
+description = "Simple `no_std` compatible ANSI escape character coloring"
+license-file = "LICENSE"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html