Add `references-empty` rule

[ManuelRauber]

Hi!

In the JavaScript version of commitlint, there is a rule references-empty that can check for ticket numbers like:

feat: foo bar 

#3

or

feat: foo bar

PROJ-23

It would be nice, if you can support those as well.

Thanks! :)

[hyiso]

@ManuelRauber v0.7.0 is release to support references-empty rule

[KeidsID]

Is it possible to modify the reference prefix like commitlint.js does?

import { RuleConfigSeverity, UserConfig } from "@commitlint/types";

const config: UserConfig = {
  extends: ["@commitlint/config-conventional"],
  parserPreset: {
    parserOpts: {
      issuePrefixes: "sv-", // `<type>: <msg> sv-<issue-num>` pattern
    },
  },
  rules: {
    "references-empty": [RuleConfigSeverity.Error, "never"],
    "scope-enum": [
      RuleConfigSeverity.Error,
      "always",
      [...],
    ],
  },
};

export default config;

Because only #<issue-num> pattern are allowed for now.

[hyiso]

@KeidsID
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