Merge pull request #2630 from terencehonles/allow-pymongo-4.x

update dependency specifier to allow pymongo 4.x

Author: bagerard

setup.py

@@ -142,7 +142,7 @@ def run_tests(self):
     platforms=["any"],
     classifiers=CLASSIFIERS,
     python_requires=">=3.6",
-    install_requires=["pymongo>=3.4,<=4.0"],
+    install_requires=["pymongo>=3.4,<5.0"],
     cmdclass={"test": PyTest},
     **extra_opts
 )