Fix macos version discrepancy (#16)

* Fix macos version discrepancy

* Added objc support

* Bumped analytics-swift dependency to latest.

* Updated CI versions

Author: bsneed

.github/workflows/swift.yml

@@ -17,11 +17,11 @@ jobs:
 
   build_and_test_examples:
     needs: cancel_previous
-    runs-on: macos-11
+    runs-on: macos-latest
     steps:
     - uses: maxim-lobanov/setup-xcode@v1
       with:
-        xcode-version: '13.0'
+        xcode-version: latest-stable
     - uses: actions/checkout@v2
     - uses: actions/cache@v2
       with:

Example/BasicExample/BasicExample.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -6,7 +6,7 @@ import PackageDescription
 let package = Package(
     name: "SegmentFirebase",
     platforms: [
-        //.macOS("10.15"),
+        .macOS("10.15"),
         .iOS("13.0"),
         .tvOS("11.0"),
         .watchOS("7.1")
@@ -23,7 +23,7 @@ let package = Package(
         .package(
             name: "Segment",
             url: "https://github.com/segmentio/analytics-swift.git",
-            from: "1.3.4"
+            from: "1.4.7"
         ),
 		.package(
 			name: "Firebase",

Package.resolved

@@ -36,6 +36,11 @@ import FirebaseAnalytics
  An implmentation of the Firebase Analytics device mode destination as a plugin.
  */
 
+@objc(SEGFirebaseDestination)
+ public class ObjCFirebaseDestination: NSObject, ObjCPlugin, ObjCPluginShim {
+     public func instance() -> EventPlugin { return FirebaseDestination() }
+ }
+
 public class FirebaseDestination: DestinationPlugin {
     public let timeline = Timeline()
     public let type = PluginType.destination