[travis] use py3.6

diff --git a/.travis.yml b/.travis.yml
index b747229eb541006f99ec7612d39ef44680572892..4a110f445796d2ce5716959c11c2c9cb2791f12d 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,6 @@
 language: python
 python:
-  - "3.7"
+  - "3.6"
 virtualenv:
   system_site_packages: true