Require Swift 5.5+ (#640)

* Require Swift 5.5+

* wip

* wip

Author: stephencelis

.github/workflows/ci.yml

@@ -9,7 +9,7 @@ on:
       - "*"
 
 jobs:
-  build:
+  macos:
     strategy:
       matrix:
         xcode:

Package.swift

@@ -1,33 +1,24 @@
-// swift-tools-version:5.0
-import Foundation
+// swift-tools-version:5.5
 import PackageDescription
 
 let package = Package(
   name: "swift-snapshot-testing",
   platforms: [
-    .iOS(.v11),
-    .macOS(.v10_10),
-    .tvOS(.v10)
+    .iOS(.v13),
+    .macOS(.v10_15),
+    .tvOS(.v13)
   ],
   products: [
     .library(
       name: "SnapshotTesting",
-      targets: ["SnapshotTesting"]),
+      targets: ["SnapshotTesting"]
+    ),
   ],
   targets: [
-    .target(
-      name: "SnapshotTesting",
-      dependencies: []),
+    .target(name: "SnapshotTesting"),
     .testTarget(
       name: "SnapshotTestingTests",
-      dependencies: ["SnapshotTesting"]),
+      dependencies: ["SnapshotTesting"]
+    )
   ]
 )
-
-if ProcessInfo.processInfo.environment.keys.contains("PF_DEVELOP") {
-  package.dependencies.append(
-    contentsOf: [
-      .package(url: "https://github.com/yonaskolb/XcodeGen.git", .exact("2.15.1")),
-    ]
-  )
-}