Update README for Swift changes (and excess whitespace)

Author: Josh Zana

README.md

@@ -250,14 +250,14 @@ To facilitate the above authorization flows, you should take the following steps
 
 #### Initialize a `DropboxClient` instance
 
-From your application delegate: 
+From your application delegate:
 
 ##### iOS
 
 ```Swift
 import SwiftyDropbox
 
-func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
+func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
     DropboxClientsManager.setupWithAppKey("<APP_KEY>")
     return true
 }
@@ -280,7 +280,7 @@ func applicationDidFinishLaunching(_ aNotification: Notification) {
 You can commence the auth flow by calling `authorizeFromController:controller:openURL` method in your application's
 view controller.
 
-From your view controller: 
+From your view controller:
 
 ##### iOS
 
@@ -303,10 +303,10 @@ func myButtonInControllerPressed() {
 import SwiftyDropbox
 
 func myButtonInControllerPressed() {
-    DropboxClientsManager.authorizeFromController(sharedWorkspace: NSWorkspace.shared(),
+    DropboxClientsManager.authorizeFromController(sharedWorkspace: NSWorkspace.shared,
                                                   controller: self,
                                                   openURL: { (url: URL) -> Void in
-                                                    NSWorkspace.shared().open(url)
+                                                    NSWorkspace.shared.open(url)
                                                   })
 }
 ```
@@ -329,7 +329,7 @@ To handle the redirection back into the Swift SDK once the authentication flow i
 ```Swift
 import SwiftyDropbox
 
-func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool {
+func application(_ app: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey : Any] = [:]) -> Bool {
     if let authResult = DropboxClientsManager.handleRedirectURL(url) {
         switch authResult {
         case .success:
@@ -541,7 +541,7 @@ client.files.deleteV2(path: "/test/path/in/Dropbox/account").response { response
         switch error as CallError {
         case .routeError(let boxed, let userMessage, let errorSummary, let requestId):
             print("RouteError[\(requestId)]:")
-            
+
             switch boxed.unboxed as Files.DeleteError {
             case .pathLookup(let lookupError):
                 switch lookupError {
@@ -584,9 +584,9 @@ client.files.deleteV2(path: "/test/path/in/Dropbox/account").response { response
 
 #### Generic network request errors
 
-In the case of a network error, errors are either specific to the endpoint (as shown above) or more generic errors. 
+In the case of a network error, errors are either specific to the endpoint (as shown above) or more generic errors.
 
-To determine if an error is route-specific or not, the error object should be cast as a `CallError`, and depending on the type of error, handled in the appropriate switch statement. 
+To determine if an error is route-specific or not, the error object should be cast as a `CallError`, and depending on the type of error, handled in the appropriate switch statement.
 
 ```Swift
 client.files.deleteV2(path: "/test/path/in/Dropbox/account").response { response, error in
@@ -730,7 +730,7 @@ The Swift SDK includes a convenience class, `DropboxClientsManager`, for integra
 
 #### Single Dropbox user case
 
-For most apps, it is reasonable to assume that only one Dropbox account (and access token) needs to be managed at a time. In this case, the `DropboxClientsManager` flow looks like this: 
+For most apps, it is reasonable to assume that only one Dropbox account (and access token) needs to be managed at a time. In this case, the `DropboxClientsManager` flow looks like this:
 
 * call `setupWithAppKey`/`setupWithAppKeyDesktop` (or `setupWithTeamAppKey`/`setupWithTeamAppKeyDesktop`) in integrating app's app delegate
 * client manager determines whether any access tokens are stored -- if any exist, one token is arbitrarily chosen to use
@@ -745,7 +745,7 @@ The `DropboxClient` (or `DropboxTeamClient`) is then used to make all of the des
 
 #### Multiple Dropbox user case
 
-For some apps, it is necessary to manage more than one Dropbox account (and access token) at a time. In this case, the `DropboxClientsManager` flow looks like this: 
+For some apps, it is necessary to manage more than one Dropbox account (and access token) at a time. In this case, the `DropboxClientsManager` flow looks like this:
 
 * access token uids are managed by the app that is integrating with the SDK for later lookup
 * call `setupWithAppKeyMultiUser`/`setupWithAppKeyMultiUserDesktop` (or `setupWithTeamAppKeyMultiUser`/`setupWithTeamAppKeyMultiUserDesktop`) in integrating app's app delegate
@@ -809,7 +809,7 @@ To ensure your changes have not broken any existing functionality, you can run a
 ## Bugs
 
 Please post any bugs to the [issue tracker](https://github.com/dropbox/SwiftyDropbox/issues) found on the project's GitHub page.
-  
+
 Please include the following with your issue:
  - a description of what is not working right
  - sample code to help replicate the issue