Fix readme reference from build-check

Author: grantjenks

pyproject.toml

@@ -8,7 +8,7 @@ description = "Sorted Containers -- Sorted List, Sorted Dict, Sorted Set"
 authors = [
     {"name" = "Grant Jenks", "email" = "[email protected]"},
 ]
-readme = "README.md"
+readme = "README.rst"
 requires-python = ">=3.2"
 license = {"text" = "Apache 2.0"}
 classifiers = [

tox.ini

@@ -59,10 +59,9 @@ commands=
 [testenv:build-check]
 description=Builds source and binary packages and uses twine check to validate
 skip_install=True
-changedir={envtmpdir}
 deps=
     build
     twine
 commands=
     python -m build
-    twine check {envtmpdir}/dist/*
+    twine check {toxinidir}/dist/*