Add support for discovering enigma2 based devices (#241)

* Create enigma2.py

* Update enigma2.py

* Fix type issue failing build

* Fix mypi version

Author: fbradyirl

netdisco/discoverables/enigma2.py

@@ -0,0 +1,10 @@
+"""Discover Enigma2 servers."""
+from . import MDNSDiscoverable
+
+
+class Discoverable(MDNSDiscoverable):
+    """Add support for discovering Enigma2 boxes."""
+
+    def __init__(self, nd):
+        """Initialize the Enigma2 discovery."""
+        super(Discoverable, self).__init__(nd, '_e2stream._tcp.local.')

tox.ini

@@ -21,6 +21,6 @@ commands =
 
 [testenv:typing]
 deps =
-    mypy>=0.650
+    mypy==0.650
 commands =
     mypy netdisco tests setup.py example_service.py