tvdb.py: When there's a next episode date, provide a time until in the return string.
tvdb.py: When there's a next episode date, provide a time until in the return string.

df-5/skybot,isislab/botbot,Jeebeevee/DouweBot_JJ15,cmarguel/skybot,Teino1978-Corp/Teino1978-Corp-skybot,ddwo/nhl-bot,SophosBlitz/glacon,callumhogsden/ausbot,parkrrr/skybot,Jeebeevee/DouweBot,andyeff/skybot,rmmh/skybot,elitan/mybot,craisins/wh2kbot,jmgao/skybot,olslash/skybot,craisins/nascarbot,crisisking/skybot,TeamPeggle/ppp-helpdesk