Breaking

• Require Node.js 8 (#28) 15425f1
• Return undefined instead of null when gateway cannot be determined 6467da3

Breaking for TypeScript users

• Only use a CommonJS export for the TypeScript definition
  You need to change import internalIp from 'internal-ip'; to import internalIp = require('internal-ip');

v4.3.0...v5.0.0