Fix. Handle new return code for curl_formget in libcurl 7.56.0
Fix. Handle new return code for curl_formget in libcurl 7.56.0

Lua-cURL/Lua-cURLv3,Lua-cURL/Lua-cURLv3,Lua-cURL/Lua-cURLv3,moteus/lua-lcurl,moteus/lua-lcurl