Prompt before updating wallaby core

[vjpr]

Issue description or question

Wallaby seems to update itself without prompting the user.

But when you are on limited data such as mobile tethering, or an ICE train in Germany (200MB max), it can be an issue.

Optional balloon notification would be good.

Code editor or IDE name and version

Visual Studio Code v1.? WebStorm v? IntelliJ IDEA v? Atom v1.? Visual Studio v? Sublime Text v3 build ?

OS name and version

Windows OSX Linux

[chrisblossom]

IMO, this should be handled by the user with a local firewall such as Little Snitch.