Update package dependencies

Package.swift

@@ -1,19 +1,19 @@
 // swift-tools-version:4.0
 import PackageDescription
 
-#if os(macOS) || os(iOS) || os(watchOS) || os(tvOS)
-let dependencies: [Package.Dependency] = []
-#else
-let dependencies: [Package.Dependency] = [.package(url: "https://github.com/IBM-Swift/CZlib.git", .exact("0.1.2"))]
-#endif
-
 let package = Package(
     name: "GzipMiddleware",
     products: [
         .library(name: "GzipMiddleware", targets: ["GzipMiddleware"])
     ],
-	dependencies: dependencies,
+	dependencies: [
+        // 💧 A server-side Swift web framework.
+        .package(url: "https://github.com/vapor/vapor.git", from: "3.0.0"),
+
+        // 🤐 Unzip archives
+        .package(url: "https://github.com/microtherion/ZIPFoundation.git", .upToNextMajor(from: "0.9.7-µ"))
+    ],
     targets: [
-        .target(name: "GzipMiddleware"),
+        .target(name: "GzipMiddleware", dependencies: ["Vapor", "ZIPFoundation"]),
     ]
 )