Fix friend section after update of save format

[robinlinden]

See #281 for PR with save format update.

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This change is 

[CLAassistant]

All committers have signed the CLA.

[GrayHatter]

Review status: 0 of 1 files reviewed at latest revision, 1 unresolved discussion.

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spec.md, line 4007 at r1 (raw file):

| `2`    | `uint16_t` Size of the friend request message (BE)         |
| `128`  | Name as a UTF-8 encoded string                             |
| `2`    | `uint16_t` Size of the name (BE)                           |

Size in bytes right?

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Comments from Reviewable

[GrayHatter]

Review status: 0 of 1 files reviewed at latest revision, 2 unresolved discussions.

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spec.md, line 4003 at r1 (raw file):

| `1`    | `uint8_t` Status                                           |
| `32`   | Long term public key                                       |
| `1024` | Friend request message as a UTF-8 encoded string           |

Does toxcore promise utf8, or valid utf8?

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Comments from Reviewable

[robinlinden]

Review status: 0 of 1 files reviewed at latest revision, 2 unresolved discussions.

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_spec.md, line 4003 at r1 (raw file):_

Previously, GrayHatter (Gregory Mullen) wrote…

> Does toxcore promise utf8, or valid utf8? >

Toxcore doesn't check what we're receiving besides that it's not too long and the spec says utf8. I think we only promise utf8.

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spec.md, line 4007 at r1 (raw file):

Previously, GrayHatter (Gregory Mullen) wrote…

> Size in bytes right? >

Correct.

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Comments from Reviewable

[iphydf]

Fix formatting (see https://travis-ci.org/TokTok/spec/builds/177544832#L246).

[nurupo]

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Reviewed 1 of 1 files at r3. Review status: all files reviewed at latest revision, 2 unresolved discussions.

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Comments from Reviewable

[GrayHatter]

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Reviewed 1 of 1 files at r3. Review status: :shipit: all files reviewed at latest revision, all discussions resolved, all commit checks successful.

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Comments from Reviewable