update classifiers

Author: rmorshea

setup.py

@@ -35,6 +35,13 @@
     "zip_safe": False,
     "setup_requires": ["setuptools_scm"],
     "use_scm_version": True,
+    "classifiers": [
+        "Intended Audience :: Developers",
+        "Intended Audience :: Science/Research",
+        "Topic :: Multimedia :: Graphics",
+        "Programming Language :: Python :: 3.7",
+        "Programming Language :: Python :: 3.8",
+    ],
 }