Update Cargo.toml

Author: nanato12

Cargo.toml

@@ -3,8 +3,14 @@ name = "line-bot-sdk-rust"
 version = "0.1.0"
 authors = ["nanato12 <admin@nanato12.info>"]
 edition = "2018"
+description = "LINE Messaging API SDK for Rust"
+readme = "README.md"
+repository = "https://github.com/nanato12/line-bot-sdk-rust/"
+license = "Apache-2.0"
+license-file = "LICENSE"
+keywords = ["line", "linebot", "line-bot-sdk", "line-messaging-api"]
+categories = ["api-bindings"]
 
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
 rocket = "0.4"