downgrade sass-loader

Author: dmt0

package.json

@@ -75,7 +75,7 @@
     "react-test-renderer": "16.12.0",
     "request": "2.88.0",
     "rimraf": "3.0.0",
-    "sass-loader": "7.3.1",
+    "sass-loader": "7.1.0",
     "style-loader": "1.0.0",
     "webpack": "4.41.2",
     "webpack-cli": "3.3.10",