fixed payload creation in GET handler for resource /time
fixed payload creation in GET handler for resource /time

sgso/libcoap,fredericgermain/libcoap,markushx/libcoap,RIOT-OS/libcoap,alexaring/libcoap,alexaring/libcoap,sgso/libcoap,sgso/libcoap,OlegHahm/libcoap,thecodemaiden/libcoap-fork,fredericgermain/libcoap,gebart/libcoap,joaopedrotaveira/libcoap,pabigot/libcoap,markushx/libcoap,alexaring/libcoap,fredericgermain/libcoap,gebart/libcoap,gebart/libcoap,authmillenon/libcoap,nmacs/libcoap,pabigot/libcoap,OlegHahm/libcoap,PolymorhicCode/libcoap,authmillenon/libcoap,RIOT-OS/libcoap,joaopedrotaveira/libcoap,nmacs/libcoap,nmacs/libcoap,markushx/libcoap,thecodemaiden/libcoap-fork,OlegHahm/libcoap,pabigot/libcoap,joaopedrotaveira/libcoap,authmillenon/libcoap