Update signatories

Author: marcprux

src/data/signatures.yaml

@@ -91,7 +91,7 @@
   url: "openrightsgroup.org"
   poc: "Jim Killock <jim@openrightsgroup.org>"
   region: GB
-- organization: "Proton"
+- organization: "Proton AG"
   url: "proton.me"
   poc: "Samuele Kaplun <samuele.kaplun@proton.ch>"
   region: CH