Update changelog in preparation for releasing v0.7.0

CHANGES.rst

@@ -1,7 +1,22 @@
 Version x.y.z (unreleased)
 ==========================
 
-Release date: unknown
+Release date: the-future
+
+New features
+------------
+
+API changes
+-----------
+
+Bug fixes
+---------
+
+
+Version 0.7.0
+=============
+
+Release date: 2018-12-12
 
 New features
 ------------
@@ -15,6 +30,14 @@ New features
   `@choldgraf`_.
 - Buildpack: added support for the nix package manager `#407`_ by
   `@costrouc`_.
+- Log a 'success' message when push is complete `#482`_ by
+  `@yuvipanda`_.
+- Allow specifying images to reuse cache from `#478`_ by
+  `@yuvipanda`_.
+- Add JupyterHub back to base environment `#467`_ by
+  `@yuvipanda`_.
+- Repo2docker has a logo! by `@agahkarakuzu`_ and `@blairhudson`_.
+- Add support for Stencila `#457`_ by `@nuest`_.
 
 
 API changes
@@ -26,6 +49,8 @@ API changes
 Bug fixes
 ---------
 
+- Update to Jupyter notebook 5.7 `#475`_ by `@betatim`_ and `@minrk`_
+
 
 
 Version 0.6
@@ -63,15 +88,25 @@ Version 0.1
 
 Released 2017-04-14
 
-.. _#453: https://github.com/jupyter/repo2docker/pull/453
+
+.. _#242: https://github.com/jupyter/repo2docker/pull/242
+.. _#407: https://github.com/jupyter/repo2docker/pull/407
 .. _#413: https://github.com/jupyter/repo2docker/pull/413
 .. _#421: https://github.com/jupyter/repo2docker/pull/421
 .. _#426: https://github.com/jupyter/repo2docker/pull/426
-.. _#242: https://github.com/jupyter/repo2docker/pull/242
-.. _#407: https://github.com/jupyter/repo2docker/pull/407
+.. _#453: https://github.com/jupyter/repo2docker/pull/453
+.. _#457: https://github.com/jupyter/repo2docker/pull/457
+.. _#475: https://github.com/jupyter/repo2docker/pull/475
+.. _#478: https://github.com/jupyter/repo2docker/pull/478
+.. _#482: https://github.com/jupyter/repo2docker/pull/482
 
+.. _@agahkarakuzu: https://github.com/agahkarakuzu
 .. _@betatim: https://github.com/betatim
+.. _@blairhudson: https://github.com/blairhudson
 .. _@choldgraf: https://github.com/choldgraf
 .. _@costrouc: https://github.com/costrouc
 .. _@dsludwig: https://github.com/dsludwig
 .. _@evertrol: https://github.com/evertrol
+.. _@minrk: https://github.com/minrk
+.. _@nuest: https://github.com/nuest
+.. _@yuvipanda: https://github.com/yuvipanda