Use circle prefix in default NPM dist channel

.circleci/config.yml

@@ -87,7 +87,7 @@ jobs:
     steps:
       - run: |
           echo export RELEASE_VERSION="0.1.0-prerelease.$(date +'%Y%m%d%H%M%S')" >> $BASH_ENV
-          echo export NPM_TAG=latest >> $BASH_ENV
+          echo export NPM_TAG=circlelatest >> $BASH_ENV
           if [ "$CIRCLE_BRANCH" == "master" ]
             then echo export NPM_TAG=circlestable >> $BASH_ENV
           fi