Change the license to MIT

Author: Seulgi Kim

Cargo.toml

@@ -3,6 +3,7 @@ name = "finally-block"
 version = "0.1.0"
 authors = ["Seulgi Kim <[email protected]>"]
 edition = "2018"
+license = "MIT"
 repository = "http://github.com/CodeChain-io/rust-finally-block"
 keywords = ["control", "raii", "finally", "block"]