Add simple notifications on job errors, completion and start. (#46)

src/render_queue.py

@@ -33,10 +33,6 @@ class RenderQueue:
     def start_queue(cls):
         cls.load_state()
 
-    @classmethod
-    def job_status_change(cls, job_id, status):
-        logger.debug(f"Job status changed: {job_id} -> {status}")
-
     @classmethod
     def add_to_render_queue(cls, render_job, force_start=False):
         logger.debug('Adding priority {} job to render queue: {}'.format(render_job.priority, render_job))