Fixes an issue with the initializer

Author: shaps80

Sources/ActivityView/ActivityItem.swift

@@ -11,7 +11,7 @@ public struct ActivityItem {
     /// - Parameters:
     ///   - items: The items to share via a `UIActivityViewController`
     ///   - activities: Custom activities you want to include in the sheet
-    public init(items: Any..., activities: [UIActivity] = [], excludedTypes: [UIActivity.ActivityType]) {
+    public init(items: Any..., activities: [UIActivity] = [], excludedTypes: [UIActivity.ActivityType] = []) {
         self.items = items
         self.activities = activities
         self.excludedTypes = excludedTypes