Update README.md

Author: coryleach

README.md

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-Library of utilities for procedural generation
+Library of utilities for procedural generation.
 
 ## Quick Package Install
 
@@ -38,7 +38,8 @@ This code is still in a pretty rough state but I've uploaded it here for those i
 There is a demo package included in the demo folder. After importing this as a package just double click it to import.  
 
 The demo requires that you import Shader Graph and the Universal Render Pipeline packages from the package manager.  
-Ensure both 'depth texture' and 'opaque texture' options on your renderer asset or set unity to use the included render assets.  
+Ensure both 'depth texture' and 'opaque texture' options on your renderer asset or set unity to use the included render assets.
+The demo may require 2019.3
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 ## Author