update nim grammar to support the new number literals

[timotheecour]

update nim syntax to support the new number literals, eg:

# currently appear broken, but fixed with this PR
let a = 12'big
let b = 13'big

Description

• https://github.com/Varriount/NimLime hasn't been updated in over 2 years, and a new feature in nim (number literals) renders really badly with existing grammar (causing subsequent line to render badly). This PR updates the submodule url and fixes the rendering of new number literals

Checklist:

• I am changing the source of a syntax highlighting grammar
  • Old: https://github-lightshow.herokuapp.com/?utf8=%E2%9C%93&scope=source.nim&grammar_format=auto&grammar_url=&grammar_text=&code_source=from-text&code_url=&code=let+a+%3D+12%27big%0D%0Alet+b+%3D+13%27big
  • New: https://github-lightshow.herokuapp.com/?utf8=%E2%9C%93&scope=from-url&grammar_format=auto&grammar_url=https%3A%2F%2Fraw.githubusercontent.com%2Ftimotheecour%2FNimLime%2Fmaster2%2FSyntaxes%2FNim.YAML-tmLanguage&grammar_text=&code_source=from-text&code_url=&code=let+a+%3D+12%27big%0D%0Alet+b+%3D+13%27big

note that I'm also adding a new file samples/Nim/main.nim which illustrates all existing nim syntax including the new number literals which currently show up incorrectly but are being fixed via this PR

I've previously contributed to this repo for nim syntax (see #4295)

links

/cc @JohnAD @Varriount

• Add support for numeric suffixes. nim-lang/NimLime#153
• move this repo to nim-lang/NimLime ? nim-lang/NimLime#154

[lildude]

LGTM 🙇

[timotheecour]

@lildude thanks! when will those changes be reflected? the snippet on top of this PR still appears broken, is there a place where i can know when the next release will happen?

[lildude]

Changes don't appear automatically. They only appear when a new release is made and I'm in the process of testing the next release for release this week. You can follow along in #5305