Update README.md

README.md

@@ -62,8 +62,6 @@ If instead, you wish to allow HTML within untrusted user-input, but still want o
 
 In both cases you should strongly consider employing defence-in-depth measures, like [deploying a Content-Security-Policy](https://scotthelme.co.uk/content-security-policy-an-introduction/) (a browser security feature) so that your page is likely to be safe even if an attacker finds a vulnerability in one of the first lines of defence above.
 
-#### Security of Parsedown Extensions
-
 Safe mode does not necessarily yield safe results when using extensions to Parsedown. Extensions should be evaluated on their own to determine their specific safety against XSS.
 
 ## Escaping HTML