Explicitly set enabled=True

IPython/nbconvert/exporters/reveal.py

@@ -45,7 +45,7 b' class RevealExporter(BasicHTMLExporter):'
         super(RevealExporter, self)._register_transformers()
         
         #Register reveal help transformer
-        self.register_transformer(transformers.RevealHelpTransformer, True)
+        self.register_transformer(transformers.RevealHelpTransformer, enabled=True)
 
     @property
     def default_config(self):

IPython/nbconvert/exporters/sphinx_howto.py

@@ -42,4 +42,4 b' class SphinxHowtoExporter(LatexExporter):'
         super(SphinxHowtoExporter, self)._register_transformers()
         
         #Register sphinx latex transformer
-        self.register_transformer(transformers.SphinxTransformer, True) 
+        self.register_transformer(transformers.SphinxTransformer, enabled=True)