Readme updates. Button color

Still working on completing the Readme.  Changed the global button colors to white on black, the new signature for PySimpleGUI.

readme.md

@@ -21,21 +21,25 @@ You can add a GUI to your command line with a single line of code.  With 3 or 4
  The customization is via the form/dialog box builder that enables users to experience all of the normal GUI widgets without having to write a lot of code.
 
 
-> Features of PySimpleGUI include:
->     Text
->     Single Line Input
->     Buttons including these types:      File Browse      Folder Browse      Non-closing return      Close form
->     Checkboxes
->     Radio Buttons
->     Icons
->     Multi-line Text Input
->     Scroll-able Output
->     Progress Bar
->     Async/Non-Blocking Windows
->     Tabbed forms
->     Persistent Windows
->     Redirect Python Output/Errors to scrolling Window
->     'Higher level' APIs (e.g. MessageBox, YesNobox, ...)
+    Features of PySimpleGUI include:
+        Text
+        Single Line Input
+        Buttons including these types:
+            File Browse
+            Folder Browse
+            Non-closing return
+            Close form
+        Checkboxes
+        Radio Buttons
+        Icons
+        Multi-line Text Input
+        Scroll-able Output
+        Progress Bar
+        Async/Non-Blocking Windows
+        Tabbed forms
+        Persistent Windows
+        Redirect Python Output/Errors to scrolling Window
+        'Higher level' APIs (e.g. MessageBox, YesNobox, ...)
 
 
 An example of many widgets used on a single form.  A little further down you'll find the FIFTEEN lines of code required to create this complex form.
@@ -199,6 +203,19 @@ We all have loops in our code.  'Isn't it joyful waiting, watching a counter scr
                       Scale=(None, None),
                       BorderWidth=DEFAULT_PROGRESS_BAR_BORDER_WIDTH):
 
+Here's the one-line Progress Meter in action!
+
+    for i in range(1,10000):
+        SG.EasyProgressMeter('My Meter', i+1, 1000, 'Optional message')
+
+That line of code resulted in this window popping up and updating.
+![progress meter 5](https://user-images.githubusercontent.com/13696193/42696912-a5c958b8-8687-11e8-9a7d-a390a465407a.jpg)
+
+A meter AND fun statistics to watch while your machine grinds away, all for the price of 1 line of code.
+With a little trickery you can provide a way to break out of your loop using the Progress Meter form.  The cancel button results in a `False` return value from `EasyProgressMeter`.  It normally returns `True`.
+
+    if not SG.EasyProgressMeter('My Meter', i+1, 10000, 'Optional message'): break
+
 # Custom Form API Calls
 
 This is the FUN part of the programming of this GUI.  In order to really get the most out of the API, you should be using an IDE that supports auto complete or will show you the definition of the function.  This will make customizing go  smoother.
@@ -478,7 +495,8 @@ A MikeTheWatchGuy production... entirely responsible for this code
 
 ## Versioning
 
-1.0.9 - July 10, 2018 - Initial Release
+1.0.9  -   July 10, 2018 - Initial Release
+1.0.21 - July 13, 2018 - Readme updates
 
   ## Code Condition
 > Make it run
@@ -497,8 +515,3 @@ This project is licensed under the MIT License - see the [LICENSE.md](LICENSE.md
 ## Acknowledgments
 
 * Jorj McKie was the motivator behind the entire project. His wxsimpleGUI concepts sparked PySimpleGUI into existence
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