[Asterisk-code-review] Update UPGRADE file for 13 branch (asterisk[master])

[Javier Acosta]

Javier Acosta has abandoned this change.

Change subject: Update UPGRADE file for 13 branch
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Abandoned

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Gerrit-MessageType: abandon
Gerrit-Change-Id: Ib85ecff92528c34b93c00788c68c794b1dd4e9a6
Gerrit-PatchSet: 1
Gerrit-Project: asterisk
Gerrit-Branch: master
Gerrit-Owner: Javier Acosta <javier.acosta at beeonline.es>