test: update to 2.1 config (#380)

.circleci/config.yml

@@ -1,4 +1,4 @@
-version: 2
+version: 2.1
 jobs:
   build:
     docker:
@@ -11,9 +11,10 @@ jobs:
 
       # Download and cache dependencies
       - restore_cache:
-          key: v1-deps-{{ .Branch }}-{{ checksum "package.json" }}
-          key: v1-deps-{{ .Branch }}
-          key: v1-deps
+          keys:
+            - v1-deps-{{ .Branch }}-{{ checksum "package.json" }}
+            - v1-deps-{{ .Branch }}
+            - v1-deps
       
       - run: node --version
       - run: npm --version
@@ -28,9 +29,7 @@ jobs:
       - run: npm run build
       - run: npm run test
 
-
 workflows:
-  version: 2
-  build:
+  build-test:
     jobs:
       - build