fix problem with passing json objects as parameters of GET request
fix problem with passing json objects as parameters of GET request

rejectedsoftware/vibe.d,AndreyMZ/vibe.d,Geod24/vibe.d,etcimon/vibe.d,etcimon/vibe.d,gedaiu/vibe.d,DBankov/vibe.d,chalucha/vibe.d