fix: Print to stderr and exit(1) when event can't send (#169)
fix: Print to stderr and exit(1) when event can't send (#169)

* Use fail when event can't send

https://github.com/getsentry/sentry-cli/issues/168

* Use standard way of returning error

getsentry/sentry-cli,getsentry/sentry-cli,getsentry/sentry-cli