Update README.md subheading (#33)

Author: gagb

README.md

@@ -3,7 +3,7 @@
 <img src="frontend/src/assets/logo.svg" alt="Magentic-UI Logo" height="100">
 
 # Magentic-UI
-_Complete complex web tasks by combining real-time browser automation with transparent, human-in-the-loop control._
+_Automate your web tasks while you stay in control_
 
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