Update README

Author: ricardopereira

README.md

@@ -1,6 +1,7 @@
 # WSPopup
 
 [![Carthage Compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg)](https://github.com/Carthage/Carthage)
+[![SwiftPM Compatible](https://img.shields.io/badge/SwiftPM-Compatible-brightgreen.svg)](https://swift.org/package-manager)
 [![Swift 5.0](https://img.shields.io/badge/Swift-5.0-orange.svg?style=flat)](https://developer.apple.com/swift/)
 [![Platforms iOS](https://img.shields.io/badge/Platforms-iOS-lightgray.svg?style=flat)](http://www.apple.com/ios/)
 [![License MIT](https://img.shields.io/badge/License-MIT-lightgrey.svg?style=flat)](https://opensource.org/licenses/MIT)
@@ -18,7 +19,7 @@ let exampleSignInView = ExampleSignInView()
 exampleSignInView.userTextField.text = "JohnDoe123"
 
 let popupViewController = WSPopupViewController(popupView: exampleSignInView)
-popupViewController.modalPresentationStyle = .overCurrentContext
+popupViewController.modalPresentationStyle = . overFullScreen
 popupViewController.modalTransitionStyle = .crossDissolve
 show(popupViewController, sender: self)
 ```
@@ -27,7 +28,7 @@ You can also just give the `UIView` Type:
 
 ``` swift
 let popupViewController = WSPopupViewController(popupViewType: ExampleSignInView.self)
-popupViewController.modalPresentationStyle = .overCurrentContext
+popupViewController.modalPresentationStyle = .overFullScreen
 popupViewController.modalTransitionStyle = .crossDissolve
 show(popupViewController, sender: self)
 ```
@@ -61,7 +62,7 @@ Download all the source files and drop them into your project.
 ## Requirements
 
 * iOS 11.0+
-* Xcode 10.2 (Swift 5.0)
+* Xcode 10+ (Swift 5.0)
 
 # Contributing