Add release notes for version 5.5

docs/source/whatsnew/github-stats-5.rst

@@ -3,6 +3,28 b''
 Issues closed in the 5.x development cycle
 ==========================================
 
+Issues closed in 5.6
+--------------------
+
+GitHub stats for 2017/09/15 - 2018/04/02 (tag: 5.5.0)
+
+These lists are automatically generated, and may be incomplete or contain duplicates.
+
+We closed 2 issues and merged 28 pull requests.
+The full list can be seen `on GitHub <https://github.com/ipython/ipython/issues?q=milestone%3A5.6>`__
+
+The following 10 authors contributed 47 commits.
+
+* Benjamin Ragan-Kelley
+* Henry Fredrick Schreiner
+* Joris Van den Bossche
+* Matthias Bussonnier
+* Mradul Dubey
+* Roshan Rao
+* Samuel Lelièvre
+* Teddy Rendahl
+* Thomas A Caswell
+* Thomas Kluyver
 
 Issues closed in 5.4
 --------------------

docs/source/whatsnew/version5.rst

@@ -2,6 +2,24 b''
  5.x Series
 ============
 
+.. _whatsnew560:
+
+IPython 5.6
+===========
+
+* In Python 3.6 and above, dictionaries preserve the order items were added to
+  them. On these versions, IPython will display dictionaries in their native
+  order, rather than sorting by the keys (:ghpull:`10958`).
+* :class:`~.IPython.display.ProgressBar` can now be used as an iterator
+  (:ghpull:`10813`).
+* The shell object gains a :meth:`~.InteractiveShell.check_complete` method,
+  to allow a smoother transition to new input processing machinery planned for
+  IPython 7 (:ghpull:`11044`).
+* IPython should start faster, as it no longer looks for all available pygments
+  styles on startup (:ghpull:`10859`).
+
+You can see all the PR marked for the `5.6. milestone <https://github.com/ipython/ipython/pulls?utf8=%E2%9C%93&q=is%3Apr+milestone%3A5.6+is%3Aclosed+NOT+%22Backport+PR%22+>`_,
+and all the `backport versions <https://github.com/ipython/ipython/pulls?utf8=%E2%9C%93&q=is%3Apr%20milestone%3A5.6%20is%3Aclosed%20%22Backport%20PR%22%20>`__.
 
 .. _whatsnew550: