v2.3.0

• [BREAKING] Account.GetBalance returns (instead of a decimal) a Balance object that includes your account balance and other properties.
• [BREAKING] NumberInsight calls, request classes, and response classes have changed slightly. The underlying calls to Nexmo's API have been updated as well. Thanks to @RabebOthmani for the PR!
• API and documentation refresh: Added missing JSON properties, updated summaries from the official docs.
• Support additional call endpoint types.
• Introduced Nexmo.Api.EnsureSuccessStatusCode configuration option. You may instruct the library to throw an exception if a request results in an unsuccessful HTTP status code.
• Address ShortCode.RequestAlert request bug.
• Expose the configuration ILoggerFactory for use with external logging implementations.