Updated SPM swift tools to 4.0

.travis.yml

@@ -14,21 +14,21 @@ matrix:
       script: env LD_LIBRARY_PATH='/usr/local/lib:/usr/local/opt/libressl/lib:$LD_LIBRARY_PATH' swift test
 
     - os: osx
-      osx_image: xcode9
+      osx_image: xcode9.3
       dist: trusty
       sudo: required
       env: ACTION=test  PLATFORM=Mac     DESTINATION='platform=OS X'
       script: set -o pipefail && xcodebuild -scheme SocketSwift -destination "$DESTINATION" $ACTION | xcpretty
 
     - os: osx
-      osx_image: xcode9
+      osx_image: xcode9.3
       dist: trusty
       sudo: required
       env: ACTION=test  PLATFORM=iOS     DESTINATION='platform=iOS Simulator,name=iPhone 6S'
       script: set -o pipefail && xcodebuild -scheme SocketSwift -destination "$DESTINATION" $ACTION | xcpretty
 
     - os: osx
-      osx_image: xcode9
+      osx_image: xcode9.3
       dist: trusty
       sudo: required
       env: ACTION=test  PLATFORM=tvOS    DESTINATION='platform=tvOS Simulator,name=Apple TV 1080p'

Package.swift

@@ -1,8 +1,23 @@
+// swift-tools-version:4.0
+
 import PackageDescription
 
 let package = Package(
     name: "SocketSwift",
+    products: [
+        .library(
+            name: "SocketSwift",
+            targets: ["SocketSwift"]),
+    ],
     dependencies: [
-        .Package(url: "https://github.com/Zewo/CLibreSSL.git", majorVersion: 3, minor: 1),
+        .package(url: "https://github.com/Zewo/CLibreSSL.git", from: "3.1.0"),
+    ],
+    targets: [
+        .target(
+            name: "SocketSwift",
+            path: "Sources"),
+        .testTarget(
+            name: "SocketSwiftTests",
+            dependencies: ["SocketSwift"]),
     ]
 )

Socket.swift.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
     s.name             = 'Socket.swift'
-    s.version          = '2.2.0'
+    s.version          = '2.2.1'
     s.summary          = 'A POSIX socket wrapper written in swift.'
     s.homepage         = 'https://github.com/BiAtoms/Socket.swift'
     s.license          = { :type => 'MIT', :file => 'LICENSE' }