Switch the CI to Elixir 1.8.1

diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 6deb0a1de56ed85132e63465b97d4a073c958bc4..30589c9c575d756bae9357acc262ba7a9268d9f8 100644 (file)
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,4 +1,4 @@
-image: elixir:1.7.2
+image: elixir:1.8.1
 
 services:
   - name: postgres:9.6.2