Output 🌅 warning message to build log, and pin static site buildpack to avoid its own deprecation warning.

Tagging a final release before archiving.

Adapts this buildpack for the change to automatically run the package.json build script in the official Node.js buildpack.

Changes are:

• the Node buildpack executes npm run build automatically (this buildpack no longer runs the build)
• the Node buildpack installs devDependencies for auto build (and afterwards it prunes them), so a confusing NODE_ENV workaround has been removed
• the Node buildpack makes all config vars available during auto build, so compile-time configuration has access to all config vars.

See #156

Configure the web server to route all not-found requests to the client-side app index.html.

See the new Routing section of README.

Runtime env vars are now compatible with create-react-app version 2's split bundles.

📚 Documentation-only release

create-react-app v2 was released, but this buildpack doesn't fully support it yet (#131).

Support for using dyno metadata during npm run build.

Support for runtime environment variables in a bundle generated at a custom path. See JS_RUNTIME_TARGET_BUNDLE config.

Support for npm Private Packages via NPM_TOKEN config var & .npmrc config file.

This is a major version (semver) because all NPM_-prefixed environment variables are now exported for the build process.