Fix and test compatability func

Author: oschwald

maxminddb/__init__.py

@@ -36,7 +36,7 @@ def open_database(database, mode=MODE_AUTO):
 
 def Reader(database):  # pylint: disable=invalid-name
     """This exists for backwards compatibility. Use open_database instead"""
-    open_database(database)
+    return open_database(database)
 
 __title__ = 'maxminddb'
 __version__ = '1.0.0'

tests/reader_test.py

@@ -351,3 +351,14 @@ class TestFileReader(BaseTestReader, unittest.TestCase):
 class TestMemoryReader(BaseTestReader, unittest.TestCase):
     mode = MODE_MEMORY
     readerClass = [maxminddb.reader.Reader]
+
+
+class TestOldReader(unittest.TestCase):
+
+    def test_old_reader(self):
+        reader = maxminddb.Reader(
+            'tests/data/test-data/MaxMind-DB-test-decoder.mmdb')
+        record = reader.get('::1.1.1.0')
+
+        self.assertEqual(record['array'], [1, 2, 3])
+        reader.close()