DOC: Add 1.0.3 whatsnew (#32746)

Author: TomAugspurger

doc/source/whatsnew/index.rst

@@ -24,6 +24,7 @@ Version 1.0
 .. toctree::
    :maxdepth: 2
 
+   v1.0.3
    v1.0.2
    v1.0.1
    v1.0.0

doc/source/whatsnew/v1.0.2.rst

@@ -122,4 +122,4 @@ Bug fixes
 Contributors
 ~~~~~~~~~~~~
 
-.. contributors:: v1.0.1..v1.0.2|HEAD
+.. contributors:: v1.0.1..v1.0.2

doc/source/whatsnew/v1.0.3.rst

@@ -0,0 +1,27 @@
+
+.. _whatsnew_103:
+
+What's new in 1.0.3 (March ??, 2020)
+------------------------------------
+
+These are the changes in pandas 1.0.3. See :ref:`release` for a full changelog
+including other versions of pandas.
+
+{{ header }}
+
+.. ---------------------------------------------------------------------------
+
+.. _whatsnew_103.regressions:
+
+Fixed regressions
+~~~~~~~~~~~~~~~~~
+
+.. _whatsnew_103.bug_fixes:
+
+Bug fixes
+~~~~~~~~~
+
+Contributors
+~~~~~~~~~~~~
+
+.. contributors:: v1.0.2..v1.0.3|HEAD