Merge branch '249-title-field-of-lesson-in-graphql' into 'master'

Resolve "Title field of lesson in graphql"

Closes #249

See merge request !356

aleksis/apps/chronos/schema/__init__.py

@@ -40,6 +40,7 @@ class LessonEventType(DjangoObjectType):
         model = LessonEvent
         fields = (
             "id",
+            "title",
             "amends",
             "datetime_start",
             "datetime_end",