v2.1.0-beta.3

• Breaking change: removed overriding output.path to "/" in the webpack config when using the CLI (#337). Note that output.path needs to be an absolute path!
• Breaking change: removed contentBase as a proxy feature (deprecated since 1.x).
• Limit websocket retries when the server can't be reached (#589).
• Improve detection for getting the server URL in the client (#496).
• Add clientLogLevel (--client-log-level for CLI) option. It controls the log messages shown in the browser. Available levels are error, warning, info or none (#579).
• Allow using no content base with the --no-content-base flag (previously it always defaulted to the working directory).
• Use stronger certs for the https modus, to prevent browsers from complaining about it (#572).