[yahoo] Add "fog" as a possible condition value.
[yahoo] Add "fog" as a possible condition value.

Although undocumented, the server returns "fog" with code "20" (documented as "foggy"). Therefore the code seems to be more reliable.
JamesKid/tmux-powerline,chocolatemelt/tmux-powerline,YOwatari/tmux-powerline,yukimemi/tmux-powerline,xinbenlv/tmux-powerline,blue119/tmux-powerline,trkw/tmux-powerline,naorunaoru/tmux-powerline,YOwatari/tmux-powerline,trkw/tmux-powerline,chocolatemelt/tmux-powerline,devmario/tmux-powerline,yukimemi/tmux-powerline,trkw/tmux-powerline,devmario/tmux-powerline,erikw/tmux-powerline,xinbenlv/tmux-powerline,YOwatari/tmux-powerline,erikw/tmux-powerline,JamesKid/tmux-powerline,naorunaoru/tmux-powerline,lewisbrown/tmux-powerline,blue119/tmux-powerline,yukimemi/tmux-powerline,naorunaoru/tmux-powerline,blue119/tmux-powerline,chocolatemelt/tmux-powerline,JamesKid/tmux-powerline,erikw/tmux-powerline,lewisbrown/tmux-powerline,xinbenlv/tmux-powerline,devmario/tmux-powerline