Release share v0.17.0 (2020-07-05)

===  Breaking changes

*  dns: replace RDataText with plain []byte

*  http: add parameter headers to client methods

*  http: return the http.Response as the first parameter

===  Bug fixes

*  http: initialize TLSClientConfig only if insecure is true

*  io: truncate file on Copy

*  websocket: fix race on pingTicker when stopping server

===  Enhancements

*  http: check for possible index.html file on getFSNode

*  http: add method Delete

*  http: add method Stop for HTTP server

*  http: check the number of bytes written on ResponseWriter.Write

*  http: log error if path not exist if debug value is set to 3 or
   greater

*  smtp: check for EOF when receiving data from server