Update Cargo.toml

Author: nanato12

Cargo.toml

@@ -1,11 +1,12 @@
 [package]
 name = "line-bot-sdk-rust"
-version = "0.1.1"
+version = "0.1.2"
 authors = ["nanato12 <[email protected]>"]
 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"]