Add dev-requirements, packaging instructions in README

README.md

@@ -147,3 +147,13 @@ environment.
     pip install pip-tools
     pip-compile  # only necessary when adding/removing a dependency
     pip-sync
+
+
+### Packaging
+
+See [https://packaging.python.org/tutorials/packaging-projects/](https://packaging.python.org/tutorials/packaging-projects/) for detailed info.
+
+0. `pip-sync requirements.txt dev-requirements.txt`
+1. Increment `version` in `setup.cfg`.
+2. `python3 -m build`
+4. `python3 -m twine upload dist/*version*`

dev-requirements.in

@@ -0,0 +1,3 @@
+-c requirements.txt
+build
+twine

dev-requirements.txt

@@ -0,0 +1,78 @@
+#
+# This file is autogenerated by pip-compile with python 3.9
+# To update, run:
+#
+#    pip-compile dev-requirements.in
+#
+bleach==4.0.0
+    # via readme-renderer
+build==0.6.0.post1
+    # via -r dev-requirements.in
+certifi==2021.5.30
+    # via requests
+cffi==1.14.6
+    # via cryptography
+charset-normalizer==2.0.4
+    # via requests
+colorama==0.4.4
+    # via twine
+cryptography==3.4.7
+    # via secretstorage
+docutils==0.17.1
+    # via readme-renderer
+idna==3.2
+    # via requests
+importlib-metadata==4.6.4
+    # via
+    #   keyring
+    #   twine
+jeepney==0.7.1
+    # via
+    #   keyring
+    #   secretstorage
+keyring==23.1.0
+    # via twine
+packaging==21.0
+    # via
+    #   bleach
+    #   build
+pep517==0.11.0
+    # via build
+pkginfo==1.7.1
+    # via twine
+pycparser==2.20
+    # via cffi
+pygments==2.10.0
+    # via readme-renderer
+pyparsing==2.4.7
+    # via packaging
+readme-renderer==29.0
+    # via twine
+requests==2.26.0
+    # via
+    #   requests-toolbelt
+    #   twine
+requests-toolbelt==0.9.1
+    # via twine
+rfc3986==1.5.0
+    # via twine
+secretstorage==3.3.1
+    # via keyring
+six==1.16.0
+    # via
+    #   bleach
+    #   readme-renderer
+tomli==1.2.1
+    # via
+    #   build
+    #   pep517
+tqdm==4.62.1
+    # via twine
+twine==3.4.2
+    # via -r dev-requirements.in
+urllib3==1.26.6
+    # via requests
+webencodings==0.5.1
+    # via bleach
+zipp==3.5.0
+    # via importlib-metadata

requirements.txt

@@ -1,7 +1,8 @@
 #
-# This file is autogenerated by pip-compile
+# This file is autogenerated by pip-compile with python 3.9
 # To update, run:
 #
-#    pip-compile
+#    pip-compile requirements.in
 #
-python-gnupg==0.4.6       # via -r requirements.in
+python-gnupg==0.4.6
+    # via -r requirements.in