update example for --remove-prefix in sass-migrator

[seiyab]

Output example below looks mistyped and I verified @import changed to @use by the command locally.

$ cat style.scss
@import "theme";

@mixin app-inverted {
  color: $app-bg-color;
  background-color: $app-color;
}
$ sass-migrator --migrate-deps module --remove-prefix=app- style.scss
$ cat style.scss
@import "theme";

@mixin inverted {
  color: theme.$bg-color;
  background-color: theme.$color;
}

But I'm not so familiar with migration command and maybe even sass. Feel free to correct me and reject it if I'm misunderstanding.

And, I'm sorry that I don't drink whisky as the contribution guide suggests.

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