add metadata for docs.rs

Author: hdevalence

Cargo.toml

@@ -3,6 +3,7 @@ name = "zkp"
 version = "0.6.0"
 authors = ["Henry de Valence <hdevalence@hdevalence.ca>"]
 license = "CC0-1.0"
+readme = "README.md"
 repository = "https://github.com/hdevalence/zkp"
 documentation = "https://docs.rs/zkp"
 categories = ["cryptography"]
@@ -12,6 +13,9 @@ exclude = [
     ".gitignore"
 ]
 
+[package.metadata.docs.rs]
+features = ["nightly"]
+
 [dependencies]
 merlin = "1"
 rand = "0.6"