docs(getset): add docstring for Getset derive macro

Author: andrewsonin

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "gset"
-version = "1.0.2"
+version = "1.0.3"
 authors = ["Andrew Sonin <sonin.cel@yandex.ru>"]
 description = "A procedural macro for generating the most basic getters and setters on fields."
 categories = ["development-tools::procedural-macro-helpers"]

src/lib.rs

@@ -13,6 +13,7 @@ use syn::{
 mod field_attribute_layout;
 mod field_attributes;
 
+/// Derives getters and setters.
 #[proc_macro_derive(Getset, attributes(getset))]
 #[proc_macro_error]
 pub fn derive_getset(input: TokenStream) -> TokenStream {