test: Just test in v12

Author: tmcw

.circleci/config.yml

@@ -2,8 +2,7 @@ workflows:
   version: 2
   node-multi-build:
     jobs:
-      - node-v8
-      - node-v10
+      - node-v12
 
 version: 2
 jobs:
@@ -30,15 +29,7 @@ jobs:
           key: yarn-packages-{{ .Branch }}-{{ checksum "yarn.lock" }}
           paths:
             - node_modules/
-  node-v6:
+  node-v12:
     <<: *node-base
     docker:
-      - image: node:6
-  node-v8:
-    <<: *node-base
-    docker:
-      - image: node:8
-  node-v10:
-    <<: *node-base
-    docker:
-      - image: node:10
+      - image: node:12