4.0.0

Changed

• Require Python 3.8+.
• Add new functions for retrieving Autonomous System data: batch_lookup_asns, lookup_asn, origin_lookup_asn.
• Add new functions for user-agent header value parsing: batch_parse_user_agents, parse_user_agent.
• API key is passed as header value and no longer as query parameter.
• Client library method are now wrapped in a new ApiResponse object that includes a mean to retrieve metadata
  about credits and throttling in addition to data.
• Introduce data model for responses to enable field value access using dot notation and ensure code autocompletion functionality.
• Rename all function and variable names to adhere to snake_case convention.
• Replace the function named lookup by 3 new functions: batch_lookup_ips, lookup_ip and origin_lookup_ip.
• Rename IpregistryConfig option apiUrl to baseUrl.
• Rename UserAgent utility class to _UserAgents.