Fix build wheel warnings (#503)

* MANIFEST.in remove non-existing included files
* setup.cfg Removing deprecated universal wheel option
* Removing deprecated tests_require parameter

Author: leszekhanusz

MANIFEST.in

@@ -6,15 +6,14 @@ include README.md
 include CONTRIBUTING.md
 include .readthedocs.yaml
 
-include dev_requirements.txt
 include Makefile
 
 include tox.ini
 
 include gql/py.typed
 
 recursive-include tests *.py *.graphql *.cnf *.yaml *.pem
-recursive-include docs *.txt *.rst conf.py Makefile make.bat *.jpg *.png *.gif
+recursive-include docs *.txt *.rst conf.py Makefile make.bat
 recursive-include docs/code_examples *.py
 
 prune docs/_build

setup.cfg

@@ -1,6 +1,3 @@
-[wheel]
-universal = 1
-
 [flake8]
 max-line-length = 88
 

setup.py

@@ -99,7 +99,6 @@
     # PEP-561: https://www.python.org/dev/peps/pep-0561/
     package_data={"gql": ["py.typed"]},
     install_requires=install_requires,
-    tests_require=install_all_requires + tests_requires,
     extras_require={
         "all": install_all_requires,
         "test": install_all_requires + tests_requires,