Enable const-generics feature on docs.rs

Author: elichai

Cargo.toml

@@ -28,6 +28,9 @@ travis-ci = { repository = "dalek-cryptography/subtle", branch = "master"}
 [dev-dependencies]
 rand = { version = "0.8" }
 
+[package.metadata.docs.rs]
+features = ["const-generics"]
+
 [features]
 const-generics = []
 # DEPRECATED: As of 2.5.1, this feature does nothing.