Add upcoming page

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+When adding a new doc section or page, please add an entry to releases/upcoming.rst.
+-->

releases/upcoming.rst

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+.. |br| raw:: html
+
+   <br />
+
+Upcoming
+========
+
+These are changes yet unreleased. If you'd like to try them out before a new official release, you can :ref:`build_source`.
+
+Added
+-----
+
+* Allow http status override through the :ref:`response.status <guc_resp_status>` GUC.
+  |br| -- `@steve-chavez <https://github.com/steve-chavez>`_
+
+Fixed
+-----
+
+* Fix showing UNKNOWN on ``postgrest --help`` invocation.
+  |br| -- `@monacoremo <https://github.com/monacoremo>`_
+
+Changed
+-------
+
+* Docker images are now optimized to be built from the scratch image. This reduces the compressed image size from over 30mb to about 4mb.
+  For more details, see `Docker image built with Nix <https://github.com/PostgREST/postgrest/tree/master/nix/docker#docker-image-built-with-nix>`_.
+  |br| -- `@monacoremo <https://github.com/monacoremo>`_