chore(deps): update dependency sass-loader to v8

Author: renovate-bot

package.json

@@ -76,7 +76,7 @@
     "prettier": "1.18.2",
     "resolve-url-loader": "3.1.0",
     "rimraf": "3.0.0",
-    "sass-loader": "7.2.0",
+    "sass-loader": "8.0.0",
     "style-loader": "1.0.0",
     "svg-sprite-loader": "4.1.3",
     "svgo": "1.3.0",