Highlight numbers that have underscores #114
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With
LANGUAGE NumericUnderscoresit's now possible to use_in numbers, e.g.,10_000, see https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0009-numeric-underscores.rstThis adds a very simple highlighting support for this, but it's not as strict as the spec and does allow some invalid cases to be highlighted -- let me know if you'd prefer this to be stricter.