#8 Add SPM support

Package.resolved

@@ -0,0 +1,16 @@
+{
+  "object": {
+    "pins": [
+      {
+        "package": "Reachability",
+        "repositoryURL": "https://github.com/lucas34/Reachability.swift.git",
+        "state": {
+          "branch": null,
+          "revision": "31b72208fcc563e3213fbd260b9300b2c0b8609f",
+          "version": "5.0.0"
+        }
+      }
+    ]
+  },
+  "version": 1
+}

Package.swift

@@ -1,28 +1,21 @@
 // swift-tools-version:4.0
-// The swift-tools-version declares the minimum version of Swift required to build this package.
-
 import PackageDescription
 
 let package = Package(
-    name: "SwiftQueue",
-    products: [
-        // Products define the executables and libraries produced by a package, and make them visible to other packages.
-        .library(
-            name: "SwiftQueue",
-            targets: ["SwiftQueue"])
-    ],
-    dependencies: [
-        // Dependencies declare other packages that this package depends on.
-        // .package(url: /* package url */, from: "1.0.0"),
-    ],
-    targets: [
-        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
-        // Targets can depend on other targets in this package, and on products in packages which this package depends on.
-        .target(
-            name: "SwiftQueue",
-            dependencies: []),
-        .testTarget(
-            name: "SwiftQueueTests",
-            dependencies: ["SwiftQueue"])
-    ]
+        name: "SwiftQueue",
+        products: [
+            .library(name: "SwiftQueue", targets: ["SwiftQueue"]),
+        ],
+        dependencies: [
+            .package(url: "https://github.com/lucas34/Reachability.swift.git", .upToNextMajor(from: "5.0.0")),
+        ],
+        targets: [
+            .target(
+                    name: "SwiftQueue",
+                    dependencies: ["Reachability"]),
+            .testTarget(
+                    name: "SwiftQueueTests",
+                    dependencies: ["SwiftQueue"]),
+        ],
+        swiftLanguageVersions: [3, 4]
 )