added note about new --force option when running winter:up

[IsaiahPaget]

Relating to wintercms/winter#1363 (comment)

I am not exactly excited about how there are two point in this 'NOTE:'

Happy to change it if there is a better way to display this info!

[LukeTowers]

We'll need to create a 1.3 branch for the docs and adjust the notes to reflect the config value that will be required to enable this behaviour that is being discussed in wintercms/winter#1363 (comment)

[IsaiahPaget]

We'll need to create a 1.3 branch for the docs and adjust the notes to reflect the config value that will be required to enable this behaviour that is being discussed in wintercms/winter#1363 (comment)

Hey, so when it comes to making new branches, are you going to make a 1.3 branch and then merge this PR into it, or is that something I should do?

[LukeTowers]

@IsaiahPaget I've created the branch and changed the target of this PR, thanks for the ping :)

[IsaiahPaget]

Is there a local lint check I can do for these docs, so I can know they are passing before I push my commit?

[LukeTowers]

We're using https://github.com/avto-dev/markdown-lint so I imagine you could just use the package that it uses.