h* tag conversion

tests.py

@@ -25,5 +25,9 @@ class ConversionTests(unittest.TestCase):
     def test_h2(self):
         self.assertEqual(md('<h2>Hello</h2>'), 'Hello\n-----\n\n')
 
+    def test_hn(self):
+        self.assertEqual(md('<h3>Hello</h3>'), '### Hello\n\n')
+        self.assertEqual(md('<h6>Hello</h6>'), '###### Hello\n\n')
+
     def test_i(self):
         self.assertEqual(md('<i>Hello</i>'), '_Hello_')