Update to last websockets project

moritzstaffel · moritzstaffel · commit 199fd5842135 · 2020-04-27T15:45:20.000+02:00
diff --git a/lib/websocketpp b/lib/websocketpp
@@ -1 +1 @@
-Subproject commit ac5d7ea5af9734de965688b54a7860259887b537
+Subproject commit 56123c87598f8b1dd471be83ca841ceae07f95ba
