Update dependency autoprefixer to v9.4.7

Author: renovate-bot

package-lock.json

@@ -43,7 +43,7 @@
     "@babel/preset-env": "7.3.1",
     "@babel/preset-react": "7.0.0",
     "@babel/preset-stage-0": "7.0.0",
-    "autoprefixer": "9.4.6",
+    "autoprefixer": "9.4.7",
     "babel-eslint": "10.0.1",
     "babel-loader": "8.0.5",
     "css-loader": "2.1.0",