fix for ci.yml

src/lib.rs

@@ -28,7 +28,7 @@
 //!  - [`std`](https://doc.rust-lang.org/std/): Enables functionality relying on the standard library.
 //!  - [`alloc`](https://doc.rust-lang.org/alloc/): Enables features which operate on containers
 //!     like [`alloc::vec::Vec`](https://doc.rust-lang.org/beta/alloc/vec/struct.Vec.html).
-//!     Enabled by the `std` features.
+//!     Enabled by the `std` feature.
 //!
 //! ## Module
 //!