peer_id: make quickcheck optional but default feature

aquatic_peer_id/Cargo.toml

@@ -12,9 +12,12 @@ rust-version.workspace = true
 [lib]
 name = "aquatic_peer_id"
 
+[features]
+default = ["quickcheck"]
+
 [dependencies]
 compact_str = "0.7"
 hex = "0.4"
 regex = "1"
 serde = { version = "1", features = ["derive"] }
-quickcheck = "1"
+quickcheck = { version = "1", optional = true }

aquatic_peer_id/src/lib.rs

@@ -195,6 +195,7 @@ impl Display for PeerClient {
     }
 }
 
+#[cfg(feature = "quickcheck")]
 impl quickcheck::Arbitrary for PeerId {
     fn arbitrary(g: &mut quickcheck::Gen) -> Self {
         let mut bytes = [0u8; 20];
@@ -207,6 +208,7 @@ impl quickcheck::Arbitrary for PeerId {
     }
 }
 
+#[cfg(feature = "quickcheck")]
 #[cfg(test)]
 mod tests {
     use super::*;