Downgrade python-future required version to 0.15.2

It works fine and this way python-future from Ubuntu 16.04 and 18.04 can be used.

diff --git a/requirements.txt b/requirements.txt
index d51dda4731aaec4d496d151b085fdee6d4c575ec..af3e5e7ea09b9e263d057f5aa90c0999ca17f603 100644 (file)
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,4 +6,4 @@ setuptools
 # Please keep it as the first item of this list.
 #
 pyserial>=3.0
-future>=0.16.0
+future>=0.15.2