added option -v to modify log level
added option -v to modify log level

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