rename planetstack module to xos
diff --git a/planetstack/dependency_walker.py b/planetstack/dependency_walker.py
index 46fe655..0b23136 100644
--- a/planetstack/dependency_walker.py
+++ b/planetstack/dependency_walker.py
@@ -2,7 +2,7 @@
 
 import os
 import imp
-from planetstack.config import Config, XOS_DIR
+from xos.config import Config, XOS_DIR
 import inspect
 import time
 import traceback