v2.3.0

Changes:

• new config 'AttachmentFilename' (default is ExceptionReport.zip)
• access to sending a report via email to API for dialogless workflow
• remove system information 'UserName' and 'MachineName' from report (privacy concern)

Fixes:

• fix default message for smtp mail send completion to cater for success/failure
• add dispose to MailMessage and SmtpClient on SendCompleted (potential memory leak)

Internal:

• update nunit to 3.7
• Demo caters to using MailSlurper