Fix image source in README.md to use the correct URL for the MASWE overview

Author: cpholguera

README.md

@@ -11,7 +11,7 @@
 The Mobile Application Security Weakness Enumeration (MASWE) is a list of common security and privacy weaknesses in mobile applications. It is intended to be used as a reference for developers, security researchers, and security professionals. It acts as the bridge between the [MASVS](https://mas.owasp.org/MASVS) and the [MASTG](https://mas.owasp.org/MASTG).
 
 <center>
-<img src="../assets/maswe-overview.png" style="width: 50%; border-radius: 5px; margin: 2em" />
+<img src="https://raw.githubusercontent.com/OWASP/mastg/master/docs/assets/maswe-overview.png" style="width: 50%; border-radius: 5px; margin: 2em" />
 </center>
 
 For its definition we draw inspiration from the [Common Weakness Enumeration (CWE)](https://cwe.mitre.org/), which is a community-developed list of common software security weaknesses. The MASWE is intended to be a **complementary list to the CWE**, focusing specifically on security weaknesses in mobile applications.