narval #3166871 narvalbot cannot connect to addresses if they do not end with "/" [done]

this does not work:

narval start http://crater2

but this does:

narval start http://crater2/
prioritynormal
typebug
done in<not specified>
load left0.000
closed by#4f408c200b8f [bot] ensure base urls end with '/' (closes #3166871)
patch[bot] ensure base urls end with '/' (closes #3166871) [applied]