update README (c-ares blocks in offline tests)
update README (c-ares blocks in offline tests)

crossdistro/netresolve,crossdistro/netresolve,pavlix/netresolve,andyvand/cygnetresolve,andyvand/cygnetresolve,andyvand/cygnetresolve,pavlix/netresolve,crossdistro/netresolve,pavlix/netresolve