Remove converse-rsm as whitelisted plugin and dependency

src/headless/converse-core.js

@@ -80,7 +80,6 @@ const CORE_PLUGINS = [
     'converse-ping',
     'converse-pubsub',
     'converse-roster',
-    'converse-rsm',
     'converse-smacks',
     'converse-status',
     'converse-vcard'

src/headless/converse-mam.js

@@ -126,7 +126,7 @@ const MAMEnabledChat = {
 
 converse.plugins.add('converse-mam', {
 
-    dependencies: ['converse-rsm', 'converse-disco', 'converse-muc'],
+    dependencies: ['converse-disco', 'converse-muc'],
 
 
     initialize () {