NEWS: 6.0 is now in alpha3

Changelog between alpha2 and alpha3:
  • PCIe improvements for Turris Omnia and Turris MOX
    (Turris Omnia should support 1 ath11k miniPCIe card - not tested,
there is a missing support in OpenWrt)
  • Added support for SFP GPON module HALNy HL-GSFP
  • Added new U-boot versions for Turris 1.x routers
  • Updated Foris Controller and TurrisHW