Propagate std and getrandom features

Author: rozbb

rand_chacha/Cargo.toml

@@ -25,6 +25,7 @@ serde_json = "1.0"
 
 [features]
 default = ["std"]
-std = ["ppv-lite86/std"]
+std = ["ppv-lite86/std", "rand_core/std"]
+getrandom = ["rand_core/getrandom"]
 simd = [] # deprecated
 serde1 = ["serde"]