README.md needs to be updated to reflect v0.2.0 spec changes

[frenchi]

The recent v0.2.0 release introduced new enhancements to the spec, but while some examples were updated in the original PR, some documentation has not been updated to reflect this.

Specific spec changes:

• OPEV-0014: Expansion of the VEX Product Field,
• OPEV-0015: Expansion of the Vulnerability Field,

So far I've found out-of-date examples in:

• README.md#L80-101,
• OPENVEX-SPEC.md,
• and also over in the examples repo.

I've started on a PR for the above, but opening this issue for discussion, in case there are any other references I've missed. Are there any other locations these should be updated?

[frenchi]

Actually, on closer inspection, the original PR fixed all the ones in this repo - closing this Issue but the ones over in the examples repo remain, so I'll open the issue over there.