Bump version number to 5.1.0. (#578)

Pick two changes to 5.0.x branch (#479)

* Bump socket.io version to 3.1.2. (#471)

* Bump elliptic from 6.5.3 to 6.5.4 (#467)

Bumps [elliptic](https://github.com/indutny/elliptic) from 6.5.3 to 6.5.4.
- [Release notes](https://github.com/indutny/elliptic/releases)
- [Commits](indutny/elliptic@v6.5.3...v6.5.4)

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Co-authored-by: jianjunz <jianjun.zhu@intel.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

OWT release 5.0 canddiate

OWT v5.0 RC2

5.0 RC1

Bump version number to 4.3.1. (#377)

Updated message log info for P2P sample

Mark some function as private in documentation. (#137)