Typo in table.csv: "es284" should be "es384"

[vdods]

Line 578 shows:

es284	varsig	0xd01201	draft	ES384 Signature Algorithm

The "es284" is clearly a typo and should be "es384". For systems that use table.csv in automation, this would cause problems.

[vdods]

This PR addresses this typo and another found in README.md

#379