Only release if the version has been seen for the first time

Author: jonbannister

.circleci/config.yml

@@ -195,7 +195,7 @@ jobs:
           command: |
             ls -la /tmp/circleci-artifacts/3_6
             VERSION=$(cat /tmp/circleci-artifacts/3_6/version.txt)
-            ghr -t ${GITHUB_TOKEN} -u ${CIRCLE_PROJECT_USERNAME} -r ${CIRCLE_PROJECT_REPONAME} -c ${CIRCLE_SHA1} -delete ${VERSION} /tmp/circleci-artifacts/3_6/dist
+            ghr -t ${GITHUB_TOKEN} -u ${CIRCLE_PROJECT_USERNAME} -r ${CIRCLE_PROJECT_REPONAME} -c ${CIRCLE_SHA1} ${VERSION} /tmp/circleci-artifacts/3_6/dist
 workflows:
   version: 2
   build_all: