1 files changed, 1 insertions, 0 deletions

diff --git a/.travis.yml b/.travis.yml
index 39db1d7..7af7beb 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,3 +1,4 @@
+version: ~> 1.0
 dist: xenial
 language: python
 cache: pip