Fix deprecation warning in test_csv2cve (#343)

Fixes #342

Author: shreyamalviya

test/test_csv2cve.py

@@ -50,4 +50,4 @@ def test_sample_csv(self):
     def test_main(self):
         """ Test running main. Likely needs to be expanded. """
         returncode = main(["csv2cve"])
-        self.assertEquals(0, returncode)
+        self.assertEqual(0, returncode)