New docstring updates. New Udemy coupon

docs/readme.md

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       <img src="https://www.dropbox.com/s/6wzf3ebmj97v4zs/PySimpleGUI-GitHub-Udemy-Course.png?raw=1" width=200 alt="PySimpleGUI Udemy Course">
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-      <h5>apply coupon for discount:<br>0D50D92ADEDA243A4A4B</h6>
-      <a href="https://www.udemy.com/course/pysimplegui/?couponCode=0D50D92ADEDA243A4A4B">click here to visit course page</a>
+      <h5>apply coupon for discount:<br>BE7BDF4D74791CDC1BF6</h6>
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 Transforms the tkinter, Qt, WxPython, and Remi (browser-based) GUI frameworks into a simpler interface.  The window definition is simplified by using Python core data types understood by beginners (lists and dictionaries). Further simplification happens by changing event handling from a callback-based model to a message passing one.  
 
 Your code is not _required_ to have an object oriented architecture which makes the package usable by a larger audience. While the architecture is simple to understand, it does not *necessarily* limit you to only simple problems.  
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   <img src="https://github-readme-stats.vercel.app/api/?username=PySimpleGUI&bg_color=3e7bac&title_color=ffdd55&icon_color=ffdd55&text_color=ffdd55&show_icons=true&count_private=true">
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 # What Is PySimpleGUI ❓