v1.4.2

Fixes

• Send meta output from tiup to stderr to not to mix with output of components (#1298, @dveeden)
• Update confusing version selection examples in help message of playground (#1318, @AstroProfundis)
• Fix the issue that tiup mirror clone command does exclude yanked component correctly (#1321, @lucklove)

Improvements

• Adjust output messages and operation processes of tiup mirror command (#1302, @AstroProfundis)
• Add tiup mirror show subcommand to display current mirror address in use (#1317, @baurine)
• Optimize error handling if root.json fails to load (#1303, @AstroProfundis)
• Update MySQL client connection example in playground (#1323, @tangenta)
• Adjust data and fields report via telemetry (#1327, @AstroProfundis)