Update dependency autoprefixer to v10.4.19

Author: renovate[bot]

package.json

@@ -11,7 +11,7 @@
   },
   "license": "ISC",
   "devDependencies": {
-    "autoprefixer": "10.4.16",
+    "autoprefixer": "10.4.19",
     "babel-core": "6.26.3",
     "babel-eslint": "10.1.0",
     "babel-loader": "9.1.3",