Relax Python requirement to account for old Python 3.5 version on Circle CI.

CHANGELOG.rst

@@ -1,6 +1,13 @@
 Changelog
 =========
 
+2020.5.1
+--------
+
+:date: 2020-05-05
+
+* Relax Python requirement to account for old Python 3.5 version on Circle CI.
+
 2020.5.0
 --------
 

setup.py

@@ -52,7 +52,7 @@ setup(
     packages=find_packages("src"),
     package_dir={"": "src"},
     include_package_data=True,
-    python_requires='>=3.7, <4',
+    python_requires='>=3.5, <4',
     install_requires=[
         "dockerflow>=2018.4.0",
         "pyhive",