Add missing dependency

Add a missing dependency on pyasn1

Change-Id: I0d16d627ffd174640ff6985d801b4035fc8fd94a
Signed-off-by: Adam Israel <adam.israel@canonical.com>
diff --git a/setup.py b/setup.py
index b27dcbe..d836d2f 100644
--- a/setup.py
+++ b/setup.py
@@ -27,6 +27,7 @@
         'theblues>=0.3.8,<1.0',
         'websockets>=4.0,<5.0',
         'paramiko',
+        'pyasn1>=0.4.4',
     ],
     include_package_data=True,
     maintainer='Adam Israel',