Java SDK 2.0

Breaking changes:

• IPInfo is renamed to IPinfo.
• IPInfoBuilder is moved into IPinfo.Builder.
• ASNResponse.numIps is now an Integer instead of a String.
• The cache implementation now only uses get and set, which accept
  arbitrary strings, which may not necessarily be IP or ASN strings like
  "1.2.3.4" and "AS123".

Additions:

• getBatch, getBatchIps and getBatchAsns allow you to do lookups of
  multiple entities at once. There is no limit to the size of inputs on these
  library calls as long as your token has quota.
• getMap will give you a map URL for https://ipinfo.io/tools/map given a list
  of IPs.
• Many new pieces of data have been added that were previously missing. The new
  dataset reflects all the new data available via raw API calls.
• The keys given to cache functions will now be versioned. IPinfo.cacheKey
  must be used to derive the correct key if doing manual lookups.