respect the virtualenv by using /usr/bin/env

Signed-off-by: S.Çağlar Onur <caglar@10ur.org>
diff --git a/planetstack/tools/copy-opencloud.py b/planetstack/tools/copy-opencloud.py
index 205ea2d..d71ebad 100644
--- a/planetstack/tools/copy-opencloud.py
+++ b/planetstack/tools/copy-opencloud.py
@@ -1,4 +1,4 @@
-#! /usr/bin/python
+#! /usr/bin/env python
 
 import base64
 import os