2018-09-20-notice: Attribute independent 2018-09-20 report correctly

Author: luke-jr

_posts/en/posts/2018-09-20-notice.md

@@ -69,6 +69,6 @@ September 19, 2018:
 
 September 20, 2018: 
 
-- 19:50 A developer by the title earlz independently discovered and reported the vulnerability to the Bitcoin Core security contact email.
+- 19:50 David Jaenson independently discovered the vulnerability, and it was reported to the Bitcoin Core security contact email.
 
 {% include references.md %}