Add release checklist (#403)

Add release checklist

MANIFEST.in

@@ -1,6 +1,6 @@
 recursive-include docs *
 recursive-include tests *
-include pytest.ini tox.ini .isort.cfg .coveragerc HISTORY.md README.md LICENSE AUTHORS
+include pytest.ini tox.ini .isort.cfg .coveragerc *.md LICENSE AUTHORS
 prune docs/_build
 prune *.pyc
 prune __pycache__

RELEASING.md

@@ -0,0 +1,29 @@
+# Release checklist
+
+Jazzband guidelines: https://jazzband.co/about/releases
+
+* [ ] Get master to the appropriate code release state.
+      [Travis CI](https://travis-ci.org/jazzband/tablib)
+      should pass on master.
+      [![Build Status](https://travis-ci.org/jazzband/tablib.svg?branch=master)](https://travis-ci.org/jazzband/tablib)
+
+* [ ] Check [HISTORY.md](https://github.com/jazzband/tablib/blob/master/HISTORY.md),
+      update version number and release date
+
+* [ ] Tag with version number and push tag, for example:
+```bash
+git tag -a v0.14.0 -m v0.14.0
+git push --tags
+```
+
+* [ ] Once Travis CI has built and uploaded distributions, check files at
+      [Jazzband](https://jazzband.co/projects/tablib) and release to
+      [PyPI](https://pypi.org/pypi/tablib)
+
+* [ ] Check installation:
+```bash
+pip uninstall -y tablib && pip install -U tablib
+```
+
+* [ ] Create new GitHub release: https://github.com/jazzband/tablib/releases/new
+  * Tag: Pick existing tag "v0.14.0"