v1.15.0

• Use http-proxy-middleware instead of http-proxy. This fixes compatibility with native web sockets (#359).
• Properly close the server, which fixes issues with the port not freeing up (#357).
• Add --stdin flag, to close the dev server on process exit (#352).
• Fix issues with incorrect socket urls (#338, #443, #447).
• Add --open flag to open a browser pointing to the server (#329).
• Add --public flag to override the url used for connecting to the web socket (#368).
• Allow array for options.contentBase, so multiple sources are allowed (#374).
• Add options.staticOptions to allow passing through Express static options (#385).
• Update self-signed certs (#436).
• Don't reload the app upon proxy errors (#478).
• Allow running dev-server behind https proxy (#470).
• Set headers on all requests to support e.g. CORS (#499).
• Fix --cacert flag not doing anything (#532).
• Allow using Express middleware (#537).