DOC: update warning on py 2.7 support

Author: jreback

doc/source/install.rst

@@ -24,11 +24,11 @@ The Python core team plans to stop supporting Python 2.7 on January 1st, 2020.
 In line with `NumPy's plans`_, all pandas releases through December 31, 2018
 will support Python 2.
 
-The final release before **December 31, 2018** will be the last release to
+The 0.24.x feature release will be the last release to
 support Python 2. The released package will continue to be available on
 PyPI and through conda.
 
-Starting **January 1, 2019**, all releases will be Python 3 only.
+ Starting **January 1, 2019**, all new feature releases (> 0.24) will be Python 3 only.
 
 If there are people interested in continued support for Python 2.7 past December
 31, 2018 (either backporting bug fixes or funding) please reach out to the

doc/source/whatsnew/v0.24.0.rst

@@ -6,9 +6,7 @@ What's New in 0.24.0 (January XX, 2019)
 .. warning::
 
    The 0.24.x series of releases will be the last to support Python 2. Future feature
-   releases will support Python 3 only.
-
-   See :ref:`install.dropping-27` for more.
+   releases will support Python 3 only. See :ref:`install.dropping-27` for more.
 
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