ci: downgrade clang image to 3.8

keplersj · keplersj · commit 2ee0e4443fb7 · 2018-04-16T14:37:59.000-06:00
This is the most recent of the clang images correctly building at the moment.
diff --git a/.circleci/config.yml b/.circleci/config.yml
@@ -3,7 +3,7 @@ version: 2
 defaults: &defaults
  working_directory: /tmp/project
  docker:
-   - image: walberla/buildenv-ubuntu-clang:4.0
+   - image: walberla/buildenv-ubuntu-clang:3.8
      environment:
        CIRCLE_BUILD_IMAGE: ubuntu
        ATOM_CHANNEL: stable
