Clarify the error message for an invalid api key slightly
Clarify the error message for an invalid api key slightly

gijsroge/spotweb,mesa57/spotweb,gijsroge/spotweb,LeeThompson/spotweb,mbirth/spotweb,rodikal/Spotweb,mesa57/spotweb,isuftin/spotweb-1,tswestendorp/spotweb,LeeThompson/spotweb,GeoffreyDijkstra/spotweb,riksmith/Spotweb,Spotweb/Spotweb,tswestendorp/spotweb,Blauwbek/spotweb,the-darkvoid/spotweb,Spotweb/Spotweb,Blauwbek/spotweb,riksmith/Spotweb,isuftin/spotweb-1,Blauwbek/spotweb,rodikal/Spotweb,mbirth/spotweb,the-darkvoid/spotweb,GeoffreyDijkstra/spotweb