Update 2020-01-22-hase.md

_posts/2020-01-22-hase.md

@@ -6,7 +6,7 @@ Philippa was one of the speakers at the [Interactive Knowledge
 Shares session](https://popl20.sigplan.org/details/hase-2020-papers/2/Interactive-Knowledge-Shares) 
 of this year’s [HASE, the Workshop on High Assurance Systems Engineering]( https://popl20.sigplan.org/home/hase-2020)
 
-HASE, part of [POPL20](https://popl20.sigplan.org) aims to forge new collaborations and initiatives which strive to provide 
+HASE, part of [POPL](https://popl20.sigplan.org) aims to forge new collaborations and initiatives which strive to provide 
 high levels of assurance about the correct operation and security properties 
 of production systems (software and hardware).