Stop checking link to chatham house rule

.lycheeignore

@@ -4,8 +4,9 @@ https://example.com/link/to/your/trusted/committer/documentation.md
 https://github.com/rcs/rcs-viewer/pull/81
 http://creativecommons.org/licenses
 https://isc-inviter.herokuapp.com
+https://innersourcecommons-inviter.herokuapp.com
 fearlesschangepatterns.com
 https://ulir.ul.ie/bitstream/handle/10344/4443/Stol_2014_inner.pdf
 .*@andrew.clegg.*
 https://m.dotdev.co/how-to-write-a-readme-that-rocks-bc29f279611a
-https://innersourcecommons-inviter.herokuapp.com
+https://www.chathamhouse.org/about-us/chatham-house-rule