Update setup.cfg to use newer licence_files key; update commands and …

…notes in Makefile for the newer build process

Makefile

@@ -1,12 +1,14 @@
 dist:
 	@echo Build python distribution
-	python setup.py sdist bdist_wheel
+	@echo "(If no 'build' module, install with 'python -m pip install build setuptools_scm')"
+	python -m build
 
 publish:
 	@echo "Publish to PyPI at https://pypi.python.org/pypi/asttokens/"
-	@echo "Version in setup.py is `python setup.py --version`"
-	@echo "Git tag is `git describe --tags`"
-	@echo "Run this manually: twine upload dist/asttokens-`python setup.py --version`*"
+	@VER=`python -c 'import setuptools_scm; print(setuptools_scm.get_version())'`; \
+	echo "Version in setup.py is $$VER"; \
+	echo "Git tag is `git describe --tags`"; \
+	echo "Run this manually: twine upload dist/asttokens-$$VER*"
 
 docs:
 	@echo Build documentation in docs/_build/html

setup.cfg

@@ -1,5 +1,5 @@
 [metadata]
-license_file = LICENSE
+license_files = LICENSE
 name = asttokens
 author = Dmitry Sagalovskiy, Grist Labs
 author_email = [email protected]