Modify META6.json highlighter

[sumanstats]

• As per https://design.raku.org/S22.html there is auth and authors field, so highlight those.

• The META6 parser at https://github.com/jonathanstowe/META6 also uses True and False in addition to true and false

  Highlight those too !

• Also its resources in META6, so change resource -> resources

• Also add meta-version field

[2colours]

The META6 parser at https://github.com/jonathanstowe/META6 also uses True and False in addition to true and false Highlight those too !

@sumanstats sorry, are you sure about this? What does it mean that it "uses them"? True and False are not valid in JSON, that's for sure.

[2colours]

Oh right... the bigger problem is that you modified the output file, not the source file. https://github.com/Raku/atom-language/blob/master/CONTRIBUTING.md#show-me-the-source-already

Please, don't merge pull requests without confirming that the modifications are at least in accordance with the way the software works.

[2colours]

Now I backported the modifications but the question about uppercase true and false still applies.