Add missing declaration-strict-value docs

Author: thibaudcolas

README.md

@@ -145,7 +145,7 @@ To get the most out of this config, it is assumed that projects have the followi
 - [`a11y/no-obsolete-element`](https://github.com/YozhikM/stylelint-a11y/blob/master/src/rules/no-obsolete-element/README.md)
 - [`a11y/no-text-align-justify`](https://github.com/YozhikM/stylelint-a11y/blob/master/src/rules/no-text-align-justify/README.md)
 - [`a11y/no-outline-none`](https://github.com/YozhikM/stylelint-a11y/blob/master/src/rules/no-outline-none/README.md)
-- [`scale-unlimited/declaration-strict-value`](https://github.com/AndyOGo/stylelint-declaration-strict-value): `color, fill, stroke, /-color/, ignoreKeywords: currentColor, inherit, transparent, initial, none`
+- [`scale-unlimited/declaration-strict-value`](https://github.com/AndyOGo/stylelint-declaration-strict-value): `color, fill, stroke, /-color/, ignoreKeywords: currentColor, inherit, transparent, initial, none, unset, Canvas, CanvasText, LinkText, VisitedText, ActiveText, ButtonFace, ButtonText, ButtonBorder, Field, FieldText, Highlight, HighlightText, SelectedItem, SelectedItemText, Mark, MarkText, GrayText, AccentColor, AccentColorText`
 
 #### Rules of `stylelint-config-standard`