feat: add subscription on error handling

Author: monochromer

README.md

@@ -40,4 +40,9 @@ ee.once('some-event-name', (...args) => {
 
 // Calls the appropriate event handlers, passing the agruments to the handlers.
 ee.emit('some-event-name', arg1, arg2, /*...*/, argN);
+
+// subscribe to errors
+ee.on('error', (eventType, error) => {
+  /* ... */
+})
 ```

src/event-emitter.js

@@ -65,8 +65,8 @@ class EventEmitter {
       this._events[type].forEach(fn => {
         try {
           fn(...args);
-        } catch(e) {
-          // TODO: add error handling
+        } catch(error) {
+          this.emit('error', type, error);
         }
       });
     };