fix(keyboard): correct Keyboard#bind and config signature

Related to bpmn-io#662

lib/features/keyboard/Keyboard.js

@@ -49,7 +49,7 @@ var compatMessage = 'Keyboard binding is now implicit; explicit binding to an el
  * `keyboard.bind=true|false` configuration option.
  *
  * @param {Object} config
- * @param {EventTarget} [config.bindTo]
+ * @param {boolean} [config.bind]
  * @param {EventBus} eventBus
  */
 export default function Keyboard(config, eventBus) {
@@ -125,10 +125,17 @@ Keyboard.prototype._isEventIgnored = function(event) {
 /**
  * Bind keyboard events to the given DOM node.
  *
+ * @overlord
+ * @deprecated
+ *
  * @param {EventTarget} node
  */
+/**
+ * Bind keyboard events to the canvas node.
+ */
 Keyboard.prototype.bind = function(node) {
 
+  // legacy <node> argument provided
   if (node) {
     console.error('unsupported argument <node>', new Error(compatMessage));
   }

lib/features/keyboard/Keyboard.spec.ts

@@ -0,0 +1,12 @@
+import Diagram from '../../Diagram';
+import Keyboard from './Keyboard';
+
+const diagram = new Diagram();
+
+let keyboard = diagram.get<Keyboard>('keyboard');
+
+keyboard.bind();
+
+keyboard.unbind();
+
+keyboard.bind(document);