Put simd_backend into default feature (#48)

* move simd to default feature

* rm simd

Co-authored-by: jkwoods <jesskwoods@gmail.com>

Cargo.toml

@@ -11,7 +11,7 @@ license-file = "LICENSE"
 keywords = ["zkSNARKs", "cryptography", "proofs"]
 
 [dependencies]
-curve25519-dalek = {version = "3.2.0", features = ["serde", "simd_backend"]}
+curve25519-dalek = {version = "3.2.0", features = ["serde"]}
 merlin = "3.0.0"
 rand = "0.7.3"
 digest = "0.8.1"
@@ -52,5 +52,6 @@ name = "nizk"
 harness = false
 
 [features]
+default = ["curve25519-dalek/simd_backend"]
 multicore = ["rayon"]
 profile = []