Prefer pep517 for building the project

MANIFEST.in

@@ -7,3 +7,4 @@ include testing/*.py
 include tox.ini
 include *.rst
 include LICENSE
+include *.toml

appveyor.yml

@@ -17,7 +17,7 @@ init:
 
   - ECHO "Updating Environment"
   - python -m pip install -U pip
-  - python -m pip install -U wheel
+  - python -m pip install -U pep517
   - python -m pip install -U --upgrade-strategy=eager tox
 
 
@@ -35,7 +35,7 @@ test_script:
 
 after_test:
   # If tests are successful, create a whl package for the project.
-  - "%CMD_IN_ENV% python setup.py bdist_wheel"
+  - python -m pep517.build --binary .
   - ps: "ls dist"
 
 artifacts:

pyproject.toml

@@ -0,0 +1,3 @@
+[build-system]
+requires = ["setuptools>=34.4", "wheel"]
+build-backend = "setuptools.build_meta"