dont escape bash variables

Author: chrisgorgo

circle.yml

@@ -23,7 +23,7 @@ deployment:
       - echo -e "$NPM_USERNAME\n$NPM_PASSWORD\n$NPM_EMAIL" | npm login
       - git checkout -f master
       # Set the version number
-      - sed -i -E 's/0.0.0/$CIRCLE_TAG/' package.json
+      - sed -i -E "s/0.0.0/$CIRCLE_TAG/" package.json
       - npm install publish
       - npm run npmPublish
       # Update gh-pages demo site