update rustfmt

rustfmt.toml

@@ -3,4 +3,6 @@ fn_args_layout = "Vertical"
 # https://github.com/rust-lang/rustfmt/blob/master/Configurations.md#merge_imports
 merge_imports = true
 # https://github.com/rust-lang/rustfmt/blob/master/Configurations.md#format_code_in_doc_comments
-format_code_in_doc_comments = true
+format_code_in_doc_comments = true
+# https://github.com/rust-lang/rustfmt/blob/master/Configurations.md#edition
+edition = "2018"

src/lib.rs

@@ -40,20 +40,20 @@
 //! #[derive(Deserialize, Debug, PartialEq)]
 //! #[serde(rename_all = "lowercase")]
 //! pub enum Size {
-//!    Small,
-//!    Medium,
-//!    Large
+//!     Small,
+//!     Medium,
+//!     Large,
 //! }
 //!
 //! #[derive(Deserialize, Debug)]
 //! struct Config {
-//!  size: Size,
+//!     size: Size,
 //! }
 //!
 //! // set env var for size as `SIZE=medium`
 //! match envy::from_env::<Config>() {
-//!   Ok(config) => println!("{:#?}", config),
-//!   Err(error) => eprintln!("{:#?}", error)
+//!     Ok(config) => println!("{:#?}", config),
+//!     Err(error) => eprintln!("{:#?}", error),
 //! }
 //! ```