fixed file-upload-button in MUC and added changes.md entry

CHANGES.md

@@ -1,5 +1,12 @@
 # Changelog
 
+## Http-File-Upload
+
+## New Features
+
+- files can now be send via http-file-upload (XEP-0363)
+- mp4 and mp3 files will now be playable directly in chat. 
+
 ## 4.0.0 (Unreleased)
 
 ## UI changes

src/converse-muc-views.js

@@ -412,6 +412,8 @@
                     'click .toggle-smiley ul.emoji-picker li': 'insertEmoji',
                     'click .toggle-clear': 'clearChatRoomMessages',
                     'click .toggle-call': 'toggleCall',
+                    'click .toggle-fileUpload': 'toggleFileUpload',
+                    'change .fileUpload_input': 'handleFileSelect',
                     'click .toggle-occupants': 'toggleOccupants',
                     'click .new-msgs-indicator': 'viewUnreadMessages',
                     'click .occupant': 'onOccupantClicked',