Fix a typo in guide.md (google#20)

elaatifi · dbieber · commit d5f56381e934 · 2017-03-14T13:37:58.000-07:00
Pipeline should extend 'object' not 'self'
diff --git a/doc/guide.md b/doc/guide.md
@@ -287,7 +287,7 @@ class DigestionStage(object):
   def status(self):
     return 'Satiated.'
 
-class Pipeline(self):
+class Pipeline(object):
 
   def __init__(self):
     self.ingestion = IngestionStage()
