Update README.md

Signed-off-by: fulleni <fulleni@hotmail.com>

Author: fulleni

README.md

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   <img src="https://avatars.githubusercontent.com/u/202675624?s=400&u=dc72a2b53e8158956a3b672f8e52e39394b6b610&v=4" alt="Flutter News App Toolkit Logo" width="220">
   <h1>Flutter News App Mobile Client</h1>
-  <p><strong>Complete, production-ready source code for a feature-rich Flutter news mobile app.</strong></p>
+  <p><strong>Complete, production-ready source code for a feature-rich Flutter news app mobile client.</strong></p>
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