Asyncftpclient: adding removeDir proc

lib/pure/asyncftpclient.nim

@@ -354,6 +354,10 @@ proc store*(ftp: AsyncFtpClient, file, dest: string,
 
   await doUpload(ftp, destFile, onProgressChanged)
 
+proc removeDir*(ftp: AsyncFtpClient, dir: string) {.async.} =
+  ## Delete a directory ``dir`` on the remote FTP server
+  assertReply(await ftp.send("RMD " & dir), "250")
+
 proc newAsyncFtpClient*(address: string, port = Port(21),
     user, pass = ""): AsyncFtpClient =
   ## Creates a new ``AsyncFtpClient`` object.
@@ -373,6 +377,8 @@ when not defined(testing) and isMainModule:
     echo await ftp.listDirs()
     await ftp.store("payload.jpg", "payload.jpg")
     await ftp.retrFile("payload.jpg", "payload2.jpg")
+    await ftp.createDir("deleteme")
+    await ftp.removeDir("deleteme")
     echo("Finished")
 
   waitFor main(ftp)