Add runtime dependency on setuptools

setuptools_rust has a runtime dependency on setuptools. Ensure that all
installations of setuptools_rust have a sufficiently recent version of
setuptools.

Fixes: #101
Signed-off-by: Christian Heimes <[email protected]>

Author: tiran

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## Unreleased
 
 - Respect `PYO3_PYTHON` and `PYTHON_SYS_EXECUTABLE` environment variables if set. [#96](https://github.com/PyO3/setuptools-rust/pull/96)
+- Add runtime dependency on setuptools >= 46.1. [#102](https://github.com/PyO3/setuptools-rust/pull/102)
 
 ## 0.11.6 (2020-12-13)
 

setup.cfg

@@ -27,7 +27,7 @@ classifiers =
 [options]
 packages = setuptools_rust
 zip_safe = True
-install_requires = semantic_version>=2.6.0; toml>=0.9.0
+install_requires = setuptools>=46.1; semantic_version>=2.6.0; toml>=0.9.0
 setup_requires = setuptools>=46.1; wheel; setuptools_scm[toml]>=3.4.3
 
 [options.entry_points]