Minor readme update

- Update in PYPI installation.

Signed-off-by: SAVAN ANADANI <Savan.Anadani@amd.com>
Change-Id: Iadc0f3885ab3cbd44ce316d037babd82bb055a65
Signed-off-by: SAVAN ANADANI <Savan.Anadani@amd.com>
(cherry picked from commit b0a8930c824f9d11275c27d76540aac9688f415e)

Author: sanadani

README.md

@@ -49,7 +49,7 @@ This file shows how to implement, build, install and run a TensorFlow-ZenDNN plu
 
 ### 1. Install wheel file using pip:
 ```
-$ pip install zentf=4.2.0
+$ pip install zentf==4.2.0
 ```
 ### 2. Install zenTF using release package.