Include missing files in sdist

[thatch]

Include missing files in sdist for #7

Tested with

+++ mktemp -d
++ D=/tmp/tmp.pwCsX3b1Mi
++ trap 'rm -rf /tmp/tmp.pwCsX3b1Mi' EXIT
++ python -m venv /tmp/tmp.pwCsX3b1Mi
++ python setup.py sdist -d /tmp/tmp.pwCsX3b1Mi
running sdist
running egg_info
writing quaerere_columbia_common.egg-info/PKG-INFO
writing dependency_links to quaerere_columbia_common.egg-info/dependency_links.txt
writing entry points to quaerere_columbia_common.egg-info/entry_points.txt
writing requirements to quaerere_columbia_common.egg-info/requires.txt
writing top-level names to quaerere_columbia_common.egg-info/top_level.txt
reading manifest file 'quaerere_columbia_common.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
writing manifest file 'quaerere_columbia_common.egg-info/SOURCES.txt'
running check
creating quaerere-columbia-common-0.1.0
creating quaerere-columbia-common-0.1.0/columbia_common
creating quaerere-columbia-common-0.1.0/columbia_common/schemas
creating quaerere-columbia-common-0.1.0/columbia_common/schemas/api_v1
creating quaerere-columbia-common-0.1.0/columbia_common/schemas/api_v1/mixins
creating quaerere-columbia-common-0.1.0/quaerere_columbia_common.egg-info
copying files to quaerere-columbia-common-0.1.0...
copying LICENSE.txt -> quaerere-columbia-common-0.1.0
copying MANIFEST.in -> quaerere-columbia-common-0.1.0
copying README.rst -> quaerere-columbia-common-0.1.0
copying VERSION -> quaerere-columbia-common-0.1.0
copying requirements-dev.txt -> quaerere-columbia-common-0.1.0
copying requirements.txt -> quaerere-columbia-common-0.1.0
copying setup.cfg -> quaerere-columbia-common-0.1.0
copying setup.py -> quaerere-columbia-common-0.1.0
copying columbia_common/__init__.py -> quaerere-columbia-common-0.1.0/columbia_common
copying columbia_common/schemas/__init__.py -> quaerere-columbia-common-0.1.0/columbia_common/schemas
copying columbia_common/schemas/api_v1/__init__.py -> quaerere-columbia-common-0.1.0/columbia_common/schemas/api_v1
copying columbia_common/schemas/api_v1/common_crawl.py -> quaerere-columbia-common-0.1.0/columbia_common/schemas/api_v1
copying columbia_common/schemas/api_v1/mixins/__init__.py -> quaerere-columbia-common-0.1.0/columbia_common/schemas/api_v1/mixins
copying columbia_common/schemas/api_v1/mixins/common_crawl.py -> quaerere-columbia-common-0.1.0/columbia_common/schemas/api_v1/mixins
copying quaerere_columbia_common.egg-info/PKG-INFO -> quaerere-columbia-common-0.1.0/quaerere_columbia_common.egg-info
copying quaerere_columbia_common.egg-info/SOURCES.txt -> quaerere-columbia-common-0.1.0/quaerere_columbia_common.egg-info
copying quaerere_columbia_common.egg-info/dependency_links.txt -> quaerere-columbia-common-0.1.0/quaerere_columbia_common.egg-info
copying quaerere_columbia_common.egg-info/entry_points.txt -> quaerere-columbia-common-0.1.0/quaerere_columbia_common.egg-info
copying quaerere_columbia_common.egg-info/requires.txt -> quaerere-columbia-common-0.1.0/quaerere_columbia_common.egg-info
copying quaerere_columbia_common.egg-info/top_level.txt -> quaerere-columbia-common-0.1.0/quaerere_columbia_common.egg-info
Writing quaerere-columbia-common-0.1.0/setup.cfg
Creating tar archive
removing 'quaerere-columbia-common-0.1.0' (and everything under it)
++ cd /
++ /tmp/tmp.pwCsX3b1Mi/bin/pip install /tmp/tmp.pwCsX3b1Mi/quaerere-columbia-common-0.1.0.tar.gz
Processing /tmp/tmp.pwCsX3b1Mi/quaerere-columbia-common-0.1.0.tar.gz
Collecting marshmallow<3,>=2.19.0 (from quaerere-columbia-common==0.1.0)
  Using cached https://files.pythonhosted.org/packages/8d/5a/c8288b3fa34bfc5afeee56454db7c239b9d2f492c36172dafabf95c780af/marshmallow-2.21.0-py2.py3-none-any.whl
Collecting quaerere-base-common (from quaerere-columbia-common==0.1.0)
  Downloading https://files.pythonhosted.org/packages/98/83/9cdcaeb5cd0b4e4f7cf18c3507c7de9e0c96110805e3c0a438e9db803273/quaerere_base_common-0.1.1-py3-none-any.whl
Installing collected packages: marshmallow, quaerere-base-common, quaerere-columbia-common
  Running setup.py install for quaerere-columbia-common: started
    Running setup.py install for quaerere-columbia-common: finished with status 'done'
Successfully installed marshmallow-2.21.0 quaerere-base-common-0.1.1 quaerere-columbia-common-0.1.0
WARNING: You are using pip version 19.2.3, however version 20.1.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.
++ echo Success
Success
+++ rm -rf /tmp/tmp.pwCsX3b1Mi