Upgrade to Node 8

services/chat/.nvmrc

@@ -1 +1 @@
-4.2.1
+8.11.1

services/chat/docker-compose.ci.yml

@@ -7,14 +7,14 @@ version: "2"
 
 services:
   test_unit:
-    image: node:4.2.1
+    image: node:8.11.1
     volumes:
       - .:/app
     working_dir: /app
     entrypoint: npm run test:unit:_run
 
   test_acceptance:
-    image: node:4.2.1
+    image: node:8.11.1
     volumes:
       - .:/app
     working_dir: /app

services/chat/docker-compose.yml

@@ -7,14 +7,14 @@ version: "2"
 
 services:
   test_unit:
-    image: node:4.2.1
+    image: node:8.11.1
     volumes:
       - .:/app
     working_dir: /app
     entrypoint: npm run test:unit
 
   test_acceptance:
-    image: node:4.2.1
+    image: node:8.11.1
     volumes:
       - .:/app
     environment: