travis: add back test on python3.5 (python3.6 is recommended but we can try to keep...

diff --git a/.travis.yml b/.travis.yml
index 8f491ae739ee301bace801fb38980757d49cc232..f461f48c95715ce30ade64b083069be9b1cda14a 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,9 @@
 jobs:
   include:
+    - os: linux
+      dist: xenial
+      language: python
+      python: "3.5"
     - os: linux
       dist: xenial
       language: python