docs.rs: Build docs with "std" feature enabled

Author: josephlr

Cargo.toml

@@ -41,3 +41,6 @@ std = []
 rustc-dep-of-std = ["compiler_builtins", "core"]
 # Unstable feature for testing
 test-in-browser = ["wasm-bindgen"]
+
+[package.metadata.docs.rs]
+features = ["std"]