allow first and next

[GeraldPape]

Allow to get both: first and next.

• platform: wienerlinien
  firstnext: both
  stops:
  • "8641"
  • "8633"

[waaeel]

You could just do the following :

sensor:
  - platform: wienerlinien
    firstnext: first
    stops:
      - "4418"
  - platform: wienerlinien
    firstnext: next
    stops:
      - "4418"

worked for me