fix unittest issue with docker pull
diff --git a/src/emuvim/test/base.py b/src/emuvim/test/base.py
index 1b06f25..397e2a1 100755
--- a/src/emuvim/test/base.py
+++ b/src/emuvim/test/base.py
@@ -100,7 +100,7 @@
         Helper to interact with local docker instance.
         """
         if self.docker_cli is None:
-            self.docker_cli = docker.Client(
+            self.docker_cli = docker.APIClient(
                 base_url='unix://var/run/docker.sock')
         return self.docker_cli