[bisq-network/bisq] Add Readme section on updating a pricenode (#4282)

[mrosseel]

The Readme is missing an explanation on how to update a running pricenode.
This PR is adding the commands used for this. 
You can view, comment on, or merge this pull request online at:

  https://github.com/bisq-network/bisq/pull/4282

-- Commit Summary --

  * add commands to update the pricenode

-- File Changes --

    M pricenode/README.md (6)

-- Patch Links --

https://github.com/bisq-network/bisq/pull/4282.patch
https://github.com/bisq-network/bisq/pull/4282.diff

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