Removed iOS platform requirements, swift-nio-ssl from:2.7.0

Author: adam-fowler

Package.swift

@@ -17,13 +17,12 @@ import PackageDescription
 
 let package = Package(
     name: "async-http-client",
-    platforms: [.iOS(.v12), .tvOS(.v12)],
     products: [
         .library(name: "AsyncHTTPClient", targets: ["AsyncHTTPClient"]),
     ],
     dependencies: [
         .package(url: "https://github.com/apple/swift-nio.git", from: "2.13.1"),
-        .package(url: "https://github.com/apple/swift-nio-ssl.git", from: "2.4.1"),
+        .package(url: "https://github.com/apple/swift-nio-ssl.git", from: "2.7.0"),
         .package(url: "https://github.com/apple/swift-nio-extras.git", from: "1.3.0"),
         .package(url: "https://github.com/adam-fowler/swift-nio-transport-services.git", .branch("master")),
     ],