message: modify badge in readme
diff: ![Ubtuntu-CI Build](https://github.com/bark-simulator/bark/workflows/CI/badge.svg)
  ![Ubtuntu-ManyLinux Build](https://github.com/bark-simulator/bark/workflows/ManyLinux/badge.svg)
  ![NIGHTLY LTL Build](https://github.com/bark-simulator/bark/workflows/NIGHTLY_LTL/badge.svg)
  -![NIGHTLY RSS Build](https://github.com/bark-simulator/bark/workflows/NIGHTLY_RSS/badge.svg)
  +![CI RSS Build](https://github.com/bark-simulator/bark/workflows/CI_RSS/badge.svg)
  ![NIGHTLY Rules MCTS Build](https://github.com/bark-simulator/bark/workflows/NIGHTLY_RULES_MCTS/badge.svg)
  # BARK - a tool for **B**ehavior benchm**ARK**ing
  