README versions badge indicates support for Python 2.7, 3.5

[danoscarmike]

I suspect this is because the most recent (non-release candidate) release was before we dropped support and that shields.io is keying off the package metadata for that release.

[tseaver]

Before making the 1.0 release, we should probably tighten up the Trove classifiers too:

diff --git a/setup.py b/setup.py
index 711783f..e6567a7 100644
--- a/setup.py
+++ b/setup.py
@@ -70,9 +70,12 @@ setuptools.setup(
         release_status,
         "Intended Audience :: Developers",
         "Operating System :: OS Independent",
+        "Programming Language :: Python",
+        "Programming Language :: Python :: 3",
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
         "Topic :: Internet",
         "Topic :: Software Development :: Libraries :: Python Modules",
     ],