Minor readme update

Author: stasel

README.md

@@ -40,15 +40,15 @@ Xcode has a built-in support for Swift package manager. You can easily add the p
 Or, you can add the following dependency to your `Package.swift` file:
 ```swift
 dependencies: [
-    .Package(url: "https://github.com/stasel/WebRTC.git", .upToNextMajor("109.0.0"))
+    .package(url: "https://github.com/stasel/WebRTC.git", .upToNextMajor("109.0.0"))
 ]
 ```
 
 Use the `latest` branch to get the most up to date binary:
 
 ```swift
 dependencies: [
-    .Package(url: "https://github.com/stasel/WebRTC.git", .branch("latest"))
+    .package(url: "https://github.com/stasel/WebRTC.git", branch: "latest")
 ]
 ```