Add swift-crypto

Author: Fernando Fernandes

Package.swift

@@ -13,11 +13,16 @@ let package = Package(
             targets: ["SwiftTrader"]
         )
     ],
-    dependencies: [],
+    dependencies: [
+        // [Server-side Support] SwiftCrypto is a Linux-compatible port of Apple's CryptoKit library.
+        .package(url: "https://github.com/apple/swift-crypto.git", from: "2.0.0")
+    ],
     targets: [
         .target(
             name: "SwiftTrader",
-            dependencies: []
+            dependencies: [
+                .product(name: "Crypto", package: "swift-crypto")
+            ]
         ),
         .testTarget(
             name: "SwiftTraderTests",

Sources/SwiftTrader/Network/Kucoin/KucoinAPI+Signature.swift

@@ -5,16 +5,9 @@
 //  Created by Fernando Fernandes on 29.01.22.
 //
 
+import Crypto
 import Foundation
 
-#if canImport(CryptoKit)
-import CryptoKit
-#elseif canImport(Vapor)
-// [Server-side Support] Vapor includes SwiftCrypto, which is a Linux-compatible port of Apple's CryptoKit library.
-// https://docs.vapor.codes/4.0/crypto/
-import Vapor
-#endif
-
 /// Holds logic to sign requests against Kucoin APIs.
 public extension KucoinAPI {