Deprecate all the things

src/structures/MessageCollector.js

@@ -1,4 +1,5 @@
 const Collector = require('./interfaces/Collector');
+const util = require('util');
 
 /**
  * @typedef {CollectorOptions} MessageCollectorOptions
@@ -50,6 +51,14 @@ class MessageCollector extends Collector {
     this.on('collect', this._reEmitter);
   }
 
+  // TODO: Remove me in v12
+  on(eventName, listener) {
+    if (eventName === 'message') {
+      listener = util.deprecate(listener, 'MessageCollector will soon no longer emit "message", use "collect" instead');
+    }
+    super.on(eventName, listener);
+  }
+
   /**
    * Handle an incoming message for possible collection.
    * @param {Message} message The message that could be collected.