updated sass

package.json

@@ -21,13 +21,13 @@
     "browserify-css": "^0.15.0",
     "core-js": "^3.2.1",
     "mkdirp": "^0.5.1",
-    "node-sass": "^4.6.1",
     "rimraf": "latest",
     "uglify-js": "^3.1.9",
     "watchify": "^3.11.1"
   },
   "dependencies": {
     "@babel/polyfill": "^7.6.0",
-    "intro.js": "^2.9.3"
+    "intro.js": "^2.9.3",
+    "node-sass": "^6.0.0"
   }
 }