10.1.0

Various fixes & improvements

• Add Sentry.Interfaces.Thread to fix stacktraces in messages.
• Add the --type and --no-stacktrace flags to mix sentry.send_test_message.
• Add support for interpolating messages (with %s) placeholders. See Sentry.capture_message/2.
• Add support for attachments; see Sentry.Attachment and Sentry.Context.add_attachment/1.