Mention SMTPClient in the README

LibCURL now has a another dependee
Merge pull request #8 from aviks/patch-1

Mention SMTPClient in the README
Int32 to Cint
Download and use libcurl from WinRPM on Windows
simpler macro modification
Merge branch 'tkelman-winrpm'
use only libcurl-4 name with version suffix

to avoid picking up the version that comes with Git
Merge pull request #11 from tkelman/patch-1

use only libcurl-4 name with version suffix
win: update package name to libcurl4. Fixes #14 #15