Update test vector to released RFC version

[inikolcev]

Fixes #308

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This change is 

[inikolcev]

@tomato42 3.6 failed in travis. Searching around for the error it looks like the issue is in pluggy, have you seen this issue before?

[tomato42]

It may be this one: pytest-dev/pytest#3753 try adding explicit dependency to build-requires.txt

[tomato42]

Reviewed 1 of 1 files at r1.
Reviewable status: all files reviewed, 5 unresolved discussions (waiting on @inikolcev)

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unit_tests/test_tls1_3_vectors.py, line 317 at r1 (raw file):

                         """))

        # calculate finished "tls13 finished"

"derive key for Finished message" or "derive key for calculation of verify_data of Finished`

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unit_tests/test_tls1_3_vectors.py, line 343 at r1 (raw file):

        server_finished_payload = server_finished_message.write()

        # prepare the handshake transcript for the next secrets

"... for the client secrets"

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unit_tests/test_tls1_3_vectors.py, line 346 at r1 (raw file):

        handshake_hashes.update(server_finished_payload)

        # derive secret "tls13 c ap traffic"

derive keys for client application traffic

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unit_tests/test_tls1_3_vectors.py, line 355 at r1 (raw file):

                         """))

        # derive secret "tls13 s ap traffic"

derive keys for server application traffic

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unit_tests/test_tls1_3_vectors.py, line 364 at r1 (raw file):

                         """))

        # derive secret "exp master"

derive exporter master secret

[tomato42]

Reviewed 2 of 2 files at r2, 1 of 1 files at r3.
Reviewable status: complete! all files reviewed, all discussions resolved

[tomato42]

looks good, thanks!