Update dependencies

[printfn]

This updates all dependencies to the latest versions. There were two updates that required code changes:

• unicode-width 0.2.0 changed the width of linebreaks from 0 to 1, so I adjusted the code to exclude line breaks when calculating string widths
• annotate-snippets 0.11.0 required some code updates

[ytmimi]

@printfn thanks, though I don't think we need to update all our dependencies right now