Show features in documentation (#2066)

Cargo.toml

@@ -18,6 +18,10 @@ repository = "https://github.com/image-rs/image"
 homepage = "https://github.com/image-rs/image"
 categories = ["multimedia::images", "multimedia::encoding", "encoding"]
 
+[package.metadata.docs.rs]
+all-features = true
+rustdoc-args = ["--cfg", "docsrs"]
+
 include = [
     "/LICENSE",
     "/README.md",
@@ -37,7 +41,7 @@ tiff = { version = "0.9.0", optional = true }
 ravif = { version = "0.11.0", optional = true }
 rgb = { version = "0.8.25", optional = true }
 mp4parse = { version = "0.17.0", optional = true }
-dav1d = { version = "0.10.1", optional = true }
+dav1d = { version = "0.10.2", optional = true }
 dcv-color-primitives = { version = "0.6.1", optional = true }
 color_quant = "1.1"
 exr = { version = "1.5.0", optional = true }

src/lib.rs

@@ -119,6 +119,7 @@
 #![cfg_attr(all(test, feature = "benchmarks"), feature(test))]
 // it's a backwards compatibility break
 #![allow(clippy::wrong_self_convention, clippy::enum_variant_names)]
+#![cfg_attr(docsrs, feature(doc_auto_cfg))]
 
 #[cfg(all(test, feature = "benchmarks"))]
 extern crate test;