Release v1.2.2

What's Changed

• Add security.md by @yadong-intel in #319
• Update grpc by @yadong-intel in #321
• Bump version to 1.2.2 by @yadong-intel in #322
• Add exception handling for options parse by @yadong-intel in #323

Full Changelog: v1.2.1...v1.2.2