Support navBarTextSubtitleColor on Android

android/app/src/main/java/com/reactnativenavigation/params/StyleParams.java

 
     public boolean titleBarHidden;
     public Color titleBarTitleColor;
+    public Color titleBarSubtitleColor;
     public Color titleBarButtonColor;
     public Color titleBarDisabledButtonColor;
     public boolean backButtonHidden;

android/app/src/main/java/com/reactnativenavigation/params/parsers/StyleParamsParser.java

         result.topBarColor = getColor("topBarColor", getDefaultTopBarColor());
         result.titleBarHidden = getBoolean("titleBarHidden", getDefaultTopBarHidden());
         result.titleBarTitleColor = getColor("titleBarTitleColor", getDefaultTitleBarColor());
+        result.titleBarSubtitleColor = getColor("titleBarSubtitleColor", getDefaultSubtitleBarColor());
         result.titleBarButtonColor = getColor("titleBarButtonColor", getTitleBarButtonColor());
         result.titleBarDisabledButtonColor = getColor("titleBarDisabledButtonColor", getTitleBarDisabledButtonColor());
         result.backButtonHidden = getBoolean("backButtonHidden", getDefaultBackButtonHidden());
         return AppStyle.appStyle == null ? new StyleParams.Color() : AppStyle.appStyle.titleBarTitleColor;
     }
 
+    private StyleParams.Color getDefaultSubtitleBarColor() {
+        return AppStyle.appStyle == null ? new StyleParams.Color() : AppStyle.appStyle.titleBarSubtitleColor;
+    }
+
     private StyleParams.Color getTitleBarButtonColor() {
         return AppStyle.appStyle == null ? new StyleParams.Color() : AppStyle.appStyle.titleBarButtonColor;
     }

android/app/src/main/java/com/reactnativenavigation/views/TitleBar.java

     public void setStyle(StyleParams params) {
         setVisibility(params.titleBarHidden ? GONE : VISIBLE);
         setTitleTextColor(params);
+        setSubtitleTextColor(params);
         colorOverflowButton(params);
     }
 
         }
     }
 
+    private void setSubtitleTextColor(StyleParams params) {
+        if (params.titleBarSubtitleColor.hasColor()) {
+            setSubtitleTextColor(params.titleBarSubtitleColor.getColor());
+        }
+    }
+
     private void addButtonsToTitleBar(List<TitleBarButtonParams> rightButtons, String navigatorEventId, Menu menu) {
         for (int i = 0; i < rightButtons.size(); i++) {
             final TitleBarButton button = new TitleBarButton(menu, this, rightButtons.get(i), navigatorEventId);

src/deprecated/platformSpecificDeprecated.android.js

     topBarColor: originalStyleObject.navBarBackgroundColor,
     titleBarHidden: originalStyleObject.navBarHidden,
     titleBarTitleColor: originalStyleObject.navBarTextColor,
+    titleBarSubtitleColor: originalStyleObject.navBarTextSubtitleColor,
     titleBarButtonColor: originalStyleObject.navBarButtonColor,
     titleBarDisabledButtonColor: originalStyleObject.titleBarDisabledButtonColor,
     backButtonHidden: originalStyleObject.backButtonHidden,