Updated Readme

Author: rastasheep

README.md

@@ -34,6 +34,10 @@ Default Options
 ----------------
 - __selector__ String _(default: `'img[data-adaptive-background="1"]'`)_ a CSS selector which denotes which images to grab/process. Ideally, this selector would start with _img_, to ensure we only grab and try to process actual images.
 - __parent__ falsy _(default: `null`)_ a CSS selector which denotes which parent to apply the background color to. By default, the color is applied to the parent one level up the DOM tree.
+- __changeTxtColor__ boolean _(default: `false`)_ option to change color of parent text according generated background image
+- __parentTxtLight__ String _(default: `#fff`)_ text color used when background color is dark
+- __parentTxtDark__ String _(default: `#000`)_ text color used when background color is light 
+
 
 __Example:__
 Call the `run` method, passing in any options you'd like to override.