• Add "Chrome parrot" for Hysteria 2.
• Update QUIC-related dependencies.
• Split the release into default flavor (Android 6.0+) and legacy flavor (Android 5.0+, with some Gradle dependencies pinned to old versions). The legacy flavor is for old devices only and using it on new devices may lead to unexpected behaviors (e.g. https://issuetracker.google.com/issues/519796838). The support for the legacy flavor is on a best-efforts basis and may be ended at any time.