Update list of checks in README

Author: sesh

README.md

@@ -109,12 +109,11 @@ Note: if you install from PyPI these dependencies are installed.
 - DNS CAA should include accounturi
 - DNS CAA should include validationmethods
 - SSL certificate must provide OCSP URI
+- SSL certificate should provide OCSP must-staple
 - Response should be a 200 (after redirects)
 
 
 
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 ## Other Tools
 
 This tool overlaps with a bunch of other online site checking tools.