When updating an event, user is then redirect to the displayed event.

Closes #105

app/controllers/events_controller.rb

@@ -60,7 +60,7 @@ class EventsController < ApplicationController
   def update
     respond_to do |format|
       if @event.update event_params
-        format.html { redirect_to :root, notice: t('.ok') }
+        format.html { redirect_to @event, notice: t('.ok') }
         format.json { head :no_content }
       else
         format.html { render action: 'edit' }

test/controllers/events_controller_test.rb

@@ -92,7 +92,7 @@ class EventsControllerTest < ActionDispatch::IntegrationTest
     }
 
     assert_empty assigns(:event).errors.messages
-    assert_redirected_to :root
+    assert_redirected_to event_url(@event)
   end
 
   test 'should not update event' do