Update `scss-lint.md`
Update `scss-lint.md`

• scss-lint readme links must be capitalized, i.e `README.md`
• Add plugin `stylelint-value-border-zero` for use with `BorderZero`
• Add plugin `stylelint-property-unknown` for use with `PropertySpelling`
• Updated `function-url-quotes` options
• Add `stylelint-scss` rules `at-import-no-partial-extension` and `at-import-no-partial-leading-underscore` for use with `ImportPath`
• Add `number-no-trailing-zeros` for use with `UnnecessaryMantissa`
• Add `selector-no-redundant-nesting-selector` for use with `UnnecessaryParentReference`
• Update `declaration-property-unit-whitelist`, previously now deprecated `property-unit-whitelist`
PhilippBaschke/convert-to-stylelint