Franz: Add proxy setting in Franz

[svdmitrij]

Feature Description

Allow setting up socks/http proxy for each or for all services

Motivation and Context

Some services (telegram, slack) blocked in our country.
I want be able access to these services.

[TheBenMay]

Looks like VPN's and proxy's are something they plan to implement in the premium version of Franz.

See https://meetfranz.com/pricing

[stale[bot]]

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