DOC: Start v1.3.4 release notes (pandas-dev#43530)

Author: simonjayhawkins

doc/source/whatsnew/index.rst

@@ -24,6 +24,7 @@ Version 1.3
 .. toctree::
    :maxdepth: 2
 
+   v1.3.4
    v1.3.3
    v1.3.2
    v1.3.1

doc/source/whatsnew/v1.3.3.rst

@@ -55,4 +55,4 @@ Bug fixes
 Contributors
 ~~~~~~~~~~~~
 
-.. contributors:: v1.3.2..v1.3.3|HEAD
+.. contributors:: v1.3.2..v1.3.3

doc/source/whatsnew/v1.3.4.rst

@@ -0,0 +1,45 @@
+.. _whatsnew_134:
+
+What's new in 1.3.4 (October ??, 2021)
+--------------------------------------
+
+These are the changes in pandas 1.3.4. See :ref:`release` for a full changelog
+including other versions of pandas.
+
+{{ header }}
+
+.. ---------------------------------------------------------------------------
+
+.. _whatsnew_134.regressions:
+
+Fixed regressions
+~~~~~~~~~~~~~~~~~
+-
+-
+
+.. ---------------------------------------------------------------------------
+
+.. _whatsnew_134.bug_fixes:
+
+Bug fixes
+~~~~~~~~~
+-
+-
+
+.. ---------------------------------------------------------------------------
+
+.. _whatsnew_134.other:
+
+Other
+~~~~~
+-
+-
+
+.. ---------------------------------------------------------------------------
+
+.. _whatsnew_134.contributors:
+
+Contributors
+~~~~~~~~~~~~
+
+.. contributors:: v1.3.3..v1.3.4|HEAD