v1.2.0

[xt0rted]

• Deprecated ref and sha outputs in favor of head_ref and head_sha.
• Added base_ref and base_sha outputs
• Bumped @actions/core from 1.2.2 to 1.2.5
• Bumped @actions/github from 2.1.1 to 4.0.0

---

This discussion was created from the release v1.2.0.