Moved the metadata into setup.cfg.

Removed setup.py.
Added pyproject.toml
Version is now fetched from git tags.
Fixed the submodule name to allow usage of non-installed tool.

pyproject.toml

@@ -0,0 +1,5 @@
+[build-system]
+requires = ["setuptools>=44", "wheel", "setuptools_scm[toml]>=3.4.3"]
+build-backend = "setuptools.build_meta"
+
+[tool.setuptools_scm]

setup.cfg

@@ -1,4 +1,28 @@
 [metadata]
-provides-extra = xpath
-requires-dist = 
-    lxml>=3.3.5; extra == 'xpath'
+name = astpath
+author = H. Chase Stevens
+author_email = chase@chasestevens.com
+license = MIT
+description = A query language for Python abstract syntax trees
+long_description = file: README.md
+long_description_content_type = text/markdown
+keywords = xpath, xml, ast, asts, syntax, query
+url = https://github.com/hchasestevens/astpath
+classifiers =
+    Development Status :: 3 - Alpha
+    Programming Language :: Python
+    Programming Language :: Python :: 2
+    Programming Language :: Python :: 2.7
+    Intended Audience :: Developers
+    Operating System :: OS Independent
+    License :: OSI Approved :: MIT License
+    Natural Language :: English
+
+[options]
+packages = astpath
+
+[options.entry_points]
+console_scripts = astpath = astpath.__main__:main
+
+[options.extras_require]
+xpath = lxml>=3.3.5