Update README.md

Author: paulveillard

README.md

@@ -53,7 +53,7 @@ DevSecOps is important for the following key reasons: *speed, and security*
 
 Across the entire software development lifecycle, these are the core stages involved, as well as the security activities required at each stage.
 <p align="center">
-  <img src="https://github.com/paulveillard/cybersecurity-devsecops/blob/main/img/secure-sldc.pn  ?raw=true" alt="Sublime's custom image"/>
+  <img src="https://github.com/paulveillard/cybersecurity-devsecops/blob/main/img/secure-sldc.png?raw=true" alt="Sublime's custom image"/>
 </p>