fixed bug in cargo.toml

Cargo.toml

@@ -9,7 +9,7 @@ repository = "https://github.com/arnaucube/babyjubjub-rs"
 readme = "README.md"
 
 [dependencies]
-ff = {package="ff_ce" , version= "0.11", features = ["derive"]}
+ff = {package="ff_ce", version= "0.11", features = ["derive"]}
 rand = "0.8"
 num = "0.4"
 num-bigint = {version = "0.4", features = ["rand"]}