readme: Fix syntax issue "Title underline too short"
@@ -67,7 +67,7 @@ enable the numpy extension by registering its handlers::
>>> jsonpickle_numpy.register_handlers()
Pandas Support
-=============
+==============
jsonpickle includes a built-in pandas extension. If would like to encode
pandas DataFrame or Series objects then you must enable the pandas extension
by registering its handlers::
