Update README.md (#5517)
Update README.md (#5517)

Version bumps to beta2
sticilface/Arduino,esp8266/Arduino,Lan-Hekary/Arduino,esp8266/Arduino,esp8266/Arduino,esp8266/Arduino,Lan-Hekary/Arduino,sticilface/Arduino,Lan-Hekary/Arduino,sticilface/Arduino,Lan-Hekary/Arduino,sticilface/Arduino,sticilface/Arduino,Lan-Hekary/Arduino,esp8266/Arduino