fix ci

.github/workflows/elixir.yml

@@ -6,7 +6,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     container:
-      image: elixir:1.9.4    
+      image: elixir:1.10.3
     services:
       db:
         image: postgres:latest
@@ -20,6 +20,9 @@ jobs:
           --health-interval 10s
           --health-timeout 5s
           --health-retries 5
+      redis:
+        image: redis:5.0.9
+        ports: ['6379:6379']
     steps:
     - uses: actions/checkout@v1
     - name: Install Ubuntu Dependencies