Cleanup default style values, bump to 1.6.0-beta.1

Author: nheagy

WordPressAuthenticator.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name          = "WordPressAuthenticator"
-  s.version       = "1.5.4-beta.3"
+  s.version       = "1.6.0-beta.1"
   s.summary       = "WordPressAuthenticator implements an easy and elegant way to authenticate your WordPress Apps."
 
   s.description   = <<-DESC

WordPressAuthenticator/Authenticator/WordPressAuthenticatorStyles.swift

@@ -61,7 +61,7 @@ public struct WordPressAuthenticatorStyle {
 
     /// Designated initializer
     ///
-    public init(primaryNormalBackgroundColor: UIColor, primaryNormalBorderColor: UIColor, primaryHighlightBackgroundColor: UIColor, primaryHighlightBorderColor: UIColor, secondaryNormalBackgroundColor: UIColor, secondaryNormalBorderColor: UIColor, secondaryHighlightBackgroundColor: UIColor, secondaryHighlightBorderColor: UIColor, disabledBackgroundColor: UIColor, disabledBorderColor: UIColor, primaryTitleColor: UIColor, secondaryTitleColor: UIColor, disabledTitleColor: UIColor, subheadlineColor: UIColor, viewControllerBackgroundColor: UIColor, navBarImage: UIImage, prologueBackgroundColor: UIColor? = nil, prologueTitleColor: UIColor? = nil) {
+    public init(primaryNormalBackgroundColor: UIColor, primaryNormalBorderColor: UIColor, primaryHighlightBackgroundColor: UIColor, primaryHighlightBorderColor: UIColor, secondaryNormalBackgroundColor: UIColor, secondaryNormalBorderColor: UIColor, secondaryHighlightBackgroundColor: UIColor, secondaryHighlightBorderColor: UIColor, disabledBackgroundColor: UIColor, disabledBorderColor: UIColor, primaryTitleColor: UIColor, secondaryTitleColor: UIColor, disabledTitleColor: UIColor, subheadlineColor: UIColor, viewControllerBackgroundColor: UIColor, navBarImage: UIImage, prologueBackgroundColor: UIColor = WPStyleGuide.wordPressBlue(), prologueTitleColor: UIColor = .white) {
         self.primaryNormalBackgroundColor = primaryNormalBackgroundColor
         self.primaryNormalBorderColor = primaryNormalBorderColor
         self.primaryHighlightBackgroundColor = primaryHighlightBackgroundColor
@@ -78,8 +78,8 @@ public struct WordPressAuthenticatorStyle {
         self.subheadlineColor = subheadlineColor
         self.viewControllerBackgroundColor = viewControllerBackgroundColor
         self.navBarImage = navBarImage
-        self.prologueBackgroundColor = prologueBackgroundColor ?? WPStyleGuide.wordPressBlue()
-        self.prologueTitleColor = prologueTitleColor ?? .white
+        self.prologueBackgroundColor = prologueBackgroundColor
+        self.prologueTitleColor = prologueTitleColor
     }
 }