chore(package): update gulp-autoprefixer to version 7.0.0 (#164)

Author: greenkeeper[bot]

package.json

@@ -48,7 +48,7 @@
     "eslint-plugin-jsx-a11y": "^6.0.2",
     "eslint-plugin-react": "^7.10.0",
     "gulp": "^4.0.0",
-    "gulp-autoprefixer": "^6.0.0",
+    "gulp-autoprefixer": "^7.0.0",
     "gulp-clean-css": "^4.0.0",
     "gulp-eslint": "^5.0.0",
     "gulp-exec": "^4.0.0",