Update README.md

Updated TF logo as per brand guidelines "https://www.tensorflow.org/extras/tensorflow_brand_guidelines.pdf"

Author: Saduf2019

README.md

@@ -1,5 +1,5 @@
 <div align="center">
-  <img src="https://www.tensorflow.org/images/tf_logo_social.png">
+  <img src=" https://www.tensorflow.org/images/tf_logo_horizontal.png">
 </div>
 
 [![Python](https://img.shields.io/pypi/pyversions/tensorflow.svg?style=plastic)](https://badge.fury.io/py/tensorflow)