Task name for QA-SRL and Adversarial NLI

- In the list of [supported tasks](https://github.com/nyu-mll/jiant/blob/32fec3659cae03e3d68a4eda0e20a6319f20c2ae/guides/tasks/supported_tasks.md), task name for QA-SRL should be `qasrl` instead of `qa-srl`.
- What should be put in `{round}` for `adversarial_nli_round`? E.g., for round 1, should we put `A1`, `R1`, or `1`?

