origin demo-dapp heroku deploy 0.6.0

heroku.log

~/Origin/demo-dapp$ git push --force heroku
Counting objects: 26, done.
Delta compression using up to 8 threads.
Compressing objects: 100% (24/24), done.
Writing objects: 100% (26/26), 4.37 KiB | 447.00 KiB/s, done.
Total 26 (delta 15), reused 5 (delta 2)
remote: Compressing source files... done.
remote: Building source:
remote:
remote: -----> Node.js app detected
remote:
remote: -----> Creating runtime environment
remote:
remote:        NPM_CONFIG_LOGLEVEL=error
remote:        NODE_VERBOSE=false
remote:        NODE_ENV=production
remote:        NODE_MODULES_CACHE=true
remote:
remote: -----> Installing binaries
remote:        engines.node (package.json):  unspecified
remote:        engines.npm (package.json):   unspecified (use default)
remote:
remote:        Resolving node version 8.x...
remote:        Downloading and installing node 8.11.2...
remote:        Using default npm version: 5.6.0
remote:
remote: -----> Restoring cache
remote:        Loading 2 from cacheDirectories (default):
remote:        - node_modules
remote:        - bower_components (not cached - skipping)
remote:
remote: -----> Building dependencies
remote:        Installing node modules (package.json + package-lock)
remote:        added 4 packages, removed 13 packages and updated 4 packages in 13.864s
remote:        Running heroku-postbuild
remote:
remote:        > [email protected] heroku-postbuild /tmp/build_609a16bc0dab47902123c47cf72da086
remote:        > npm run build
remote:
remote:
remote:        > [email protected] build /tmp/build_609a16bc0dab47902123c47cf72da086
remote:        > NODE_ENV=production webpack --progress --display errors-only
remote:
remote: Failed to load ./.env.
remote: clean-webpack-plugin: /tmp/build_609a16bc0dab47902123c47cf72da086/build has been removed.
remote:
remote: -----> Caching build
remote:        Clearing previous node cache
remote:        Saving 2 cacheDirectories (default):
remote:        - node_modules
remote:        - bower_components (nothing to cache)
remote:
remote: -----> Pruning devDependencies
remote:        Skipping because npm 5.6.0 sometimes fails when running 'npm prune' due to a known issue
remote:        https://github.com/npm/npm/issues/19356
remote:
remote:        You can silence this warning by updating to at least npm 5.7.1 in your package.json
remote:        https://devcenter.heroku.com/articles/nodejs-support#specifying-an-npm-version
remote:
remote: -----> Build succeeded!
remote: -----> Discovering process types
remote:        Procfile declares types     -> (none)
remote:        Default types for buildpack -> web
remote:
remote: -----> Compressing...
remote:        Done: 65.7M
remote: -----> Launching...
remote:        Released v6
remote:        https://origin-demo-dapp-stan.herokuapp.com/ deployed to Heroku
remote:
remote: Verifying deploy.... done.
To https://git.heroku.com/origin-demo-dapp-stan.git
 + c3fd16d...4f57cba master -> master (forced update)