archiveRetriever 0.4.0

• Replace deprecated functions of dependencies
• Fix bugs in archive_overview() and retrieve_urls()
• New option nonArchive added to retrieve_links() and scrape_urls(). This option allows users to scrape internet pages not stemming from the Internet Archive.
• New feature added to the collapse option of scrape_urls(). collapse can now also take a Xpath as input, to collapse results based on a structuring Xpath. Unfortunately, this works only with Xpaths and not with CSS selectors. If used, Paths refers only to children of the structuring Xpath given in collapse.