Reduce version requirement (#50)

Author: daxpedda

Cargo.toml

@@ -9,7 +9,7 @@ name = "voprf"
 readme = "README.md"
 repository = "https://github.com/novifinancial/voprf/"
 resolver = "2"
-rust-version = "1.51.0"
+rust-version = "1.51"
 version = "0.3.0"
 
 [features]