MAC.address 0.1.0

• get_MAC() now works on Linux, macOS and Windows and returns a named vector
  of addresses per interface, instead of the raw ifconfig output.
• search_MAC() supports hyphen and Cisco dotted notation, requires a
  consistent separator inside each address and no longer matches pieces of
  longer hexadecimal strings. New normalize and unique arguments.
• New normalize_MAC(), is_MAC() and is_local_MAC().
• New get_oui_registry() and lookup_vendor() to identify the manufacturer
  using the IEEE MA-L, MA-M and MA-S registries.
• New get_arp_table(): IP and MAC addresses of the neighbors in the ARP
  cache (Linux, macOS, Windows).
• New is_multicast_MAC(), random_MAC() and eui64_MAC() (IPv6 modified
  EUI-64 identifier and link-local address).
• search_MAC(sep = character()) searches only the Cisco dotted notation.
• Removed the magrittr and stringr dependencies.
• First CRAN release.