Add approval step to CircleCI (#20)

Author: deliahu

.circleci/config.yml

@@ -12,14 +12,14 @@ jobs:
       - run:
           name: Go Tests
           command: make test-go
-  release-test:
+  test-release:
     docker:
       - image: circleci/golang:1.11.5
     steps:
       - checkout
       - run:
           name: Version Test
-          command: if build/is-release-branch.sh $CIRCLE_BRANCH; then make find-missing-version; fi
+          command: make find-missing-version
   deploy:
     docker:
       - image: circleci/golang:1.11.5
@@ -37,11 +37,25 @@ workflows:
   build_and_test:
     jobs:
       - test
-      - release-test
+      - test-release:
+          filters:
+            branches:
+              only:
+                - /^[0-9]\.[0-9]$/
+      - deploy-approval:
+          type: approval
+          requires:
+            - test
+            - test-release
+          filters:
+            branches:
+              only:
+                - /^[0-9]\.[0-9]$/
       - deploy:
           requires:
-            - release-test
             - test
+            - test-release
+            - deploy-approval
           filters:
             branches:
               only: