Added support for AS domain, AS usage type and AS CIDR

Fixed IPv6 not supported error for Teredo/6to4 when using IPv4 BIN

Fixed TypeScript definition for latitude/longitude to be either strin…

…g or number

Fixed wrong value returned by cidrToIPV6 function

Added async functions

Added support for district, ASN and AS

Changed to native BigInt

Update readme

Added Country class to query country information and Region class to …

…lookup the ISO 3166-2 subdivision code for country code and region name

Update TypeScript definition