Update hello world component example.

Author: adamghill

example/unicorn/components/hello_world.py

@@ -1,3 +1,5 @@
+from django.utils.timezone import now
+
 from django_unicorn.components import UnicornView
 
 
@@ -8,3 +10,4 @@ class HelloWorldView(UnicornView):
 
     def set_name(self):
         self.name = "set_name method called"
+        return "set_name called at " + now().strftime("%H:%M:%S.%f")

example/unicorn/templates/unicorn/hello-world-test.html

@@ -1,5 +1,7 @@
 <div>
   <button unicorn:click="$reset">Reset the component</button>
+  <button onclick="document.getElementById('name').value = 'asdf';">Plain JS set value on key1</button>
+  <button onclick="Unicorn.trigger('unicorn.components.hello_world.HelloWorldView', 'key1')">Trigger key1</button>
   <br />
   <br />