Fix the color of the cart button in the app header. (#35)

* Fix the color of the cart button in the app header.

* bump version

Author: markbrocato

package.json

@@ -1,6 +1,6 @@
 {
   "name": "react-storefront",
-  "version": "7.2.2",
+  "version": "7.2.3",
   "description": "Build and deploy e-commerce progressive web apps (PWAs) in record time.",
   "module": "./index.js",
   "license": "Apache-2.0",

src/CartButton.js

@@ -11,9 +11,7 @@ export const styles = theme => ({
   /**
    * Styles applied to the [`Link`](/apiReference/link%2fLink) element used as the root.
    */
-  link: {
-    color: 'inherit',
-  },
+  link: {},
   /**
    * Styles passed through to the [`Badge`](https://material-ui.com/api/badge/#css) element's
    * `badge` CSS rule.
@@ -25,7 +23,9 @@ export const styles = theme => ({
   /**
    * Styles applied to the button icon.
    */
-  icon: {},
+  icon: {
+    color: theme.palette.action.active,
+  },
 })
 
 const useStyles = makeStyles(styles, { name: 'RSFCartButton' })