Bump version to 0.3.18

Author: andrie

DESCRIPTION

@@ -15,8 +15,8 @@ Description: The goal of checkpoint is to solve the problem of package
     server (http://mran.microsoft.com/). Immediately after completion
     of the rsync mirror process, the process takes a snapshot, thus creating the
     archive. Snapshot archives exist starting from 2014-09-17.
-Version: 0.3.17
-Date: 2016-10-26
+Version: 0.3.18
+Date: 2016-10-28
 Author: Microsoft Corporation
 Maintainer: Andrie de Vries <[email protected]>
 Copyright: Microsoft

R/mranUrl.R

@@ -120,7 +120,7 @@ tryUrl <- function(url){
 
 #' Read list of available snapshot dates from MRAN url.
 #' 
-#' @param mranRootUrl URL of MRAN root, e.g. \code{"http://mran.microsoft.com/snapshot/"} or \code{"file:///local/path"}
+#' @param mranRootUrl URL of MRAN root, e.g. \code{"https://mran.microsoft.com/snapshot/"} or \code{"file:///local/path"}
 #' 
 #' @export
 getValidSnapshots <- function(mranRootUrl = mranUrl()){