chore(cargo): add keywords to Cargo.toml

Author: seanmonstar

Cargo.toml

@@ -9,6 +9,7 @@ repository = "https://github.com/hyperium/hyper"
 license = "MIT"
 authors = ["Sean McArthur <[email protected]>",
            "Jonathan Reem <[email protected]>"]
+keywords = ["http", "hyper", "hyperium"]
 
 [dependencies]
 cookie = "*"