uses latest elixir for verification tests

mneudert · mneudert · commit 24d3f4bb1d16 · 2018-07-22T14:00:36.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -18,8 +18,8 @@ jobs:
       otp_release: 21.0
       after_success: mix coveralls.travis
     - stage: verify
-      elixir: 1.3.4
-      otp_release: 18.3
+      elixir: 1.6.6
+      otp_release: 21.0
       env: MIX_ENV=prod
       script: |-
         cd "${TRAVIS_BUILD_DIR}/verify"
