CLN: Removed outtype in DataFrame.to_dict (pandas-dev#13627)

Follows up from pandas-dev#8486 in 0.15.0 by removing outtype in DataFrame.to_dict()

Author: gfyoung

doc/source/whatsnew/v0.19.0.txt

@@ -443,6 +443,7 @@ Removal of prior version deprecations/changes
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 - ``DataFrame.to_csv()`` has dropped the ``engine`` parameter, as was deprecated in 0.17.1 (:issue:`11274`, :issue:`13419`)
+- ``DataFrame.to_dict()`` has dropped the ``outtype`` parameter in favor of ``orient`` (:issue:`13627`, :issue:`8486`)
 
 
 .. _whatsnew_0190.performance:

pandas/core/frame.py

@@ -818,7 +818,6 @@ def from_dict(cls, data, orient='columns', dtype=None):
 
         return cls(data, index=index, columns=columns, dtype=dtype)
 
-    @deprecate_kwarg(old_arg_name='outtype', new_arg_name='orient')
     def to_dict(self, orient='dict'):
         """Convert DataFrame to dictionary.