Merge pull request #126 from philwareham/greenkeeper/autoprefixer-9.7.4

Greenkeeper/autoprefixer 9.7.4

Author: philwareham

package-lock.json

@@ -9,7 +9,7 @@
     "url": "https://github.com/philwareham/textpattern-uikit/issues"
   },
   "devDependencies": {
-    "autoprefixer": "9.7.2",
+    "autoprefixer": "9.7.4",
     "cssnano": "4.1.10",
     "grunt": "~1.0",
     "grunt-cli": "~1",