fix(rules): do not negate case rules

[JLHwung]

Description

Change subject-case rule on config-conventional and config-angular to non-negating rules.

Motivation and Context

Many scripts, i.e. Han, Devanagari, are not cased. Thus ensureCase will always return true for texts written in these scripts on any case rules.

Negating case rules will cause test: 你好 as invalid since they are conformed to any case rules.

For definition of cased, see http://unicode.org/reports/tr44/#Cased

Usage examples

// commitlint.config.js
module.exports = {

};

echo "your commit message here" | commitlint # fails/passes

How Has This Been Tested?

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

Further plans for discussion

Deprecate the use of never on case rules as

• there exists many scripts not cased
• Better warnings on casing policy when commit messages fails. Think about comparing

subject must not be sentence-case, start-case, pascal-case, upper-case [subject-case]

with

subject must be lower-case, kebab-case, camel-case, snake-case [subject-case]

[marionebl]

Thank you. <3