build: update angular/ngcontainer to tag latest (#84)

renovate[bot] · dherges · commit c7c48daa0717 · 2018-04-09T12:59:46.000+02:00
diff --git a/.circleci/config.yml b/.circleci/config.yml
@@ -1,7 +1,7 @@
 version: 2
 defaults: &defaults
   docker:
-    - image: angular/ngcontainer:latest
+    - image: angular/ngcontainer:latest@sha256:b4c755e59cef8656d43885fc70c8cbd91ec802a614eb08ecc96b4e9e3acd1efd
   working_directory: ~/repo
 
 jobs:
