doc: add upgrading instructions and link to migration guide; #450

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@ -74,6 +74,17 @@ for file in $fisher_path/conf.d/*.fish
end
```
### Migrating from V2 to V3
The easiest way to upgrade to V3 from V2 is to uninstall V2 first using:
```
fisher self-uninstall
```
...and install V3 from scratch using the recommended [installation instructions](https://github.com/jorgebucaran/fisher#installation). See [#450](https://github.com/jorgebucaran/fisher/issues/450) for more options.
## Usage
You've found an interesting utility you'd like to try out. Or perhaps you've [created a package](#creating-your-own-package) yourself. How do you install it on your system? You may want to update or remove it later too. How do you do that?