Merge pull request #1393 from liqd/renovate/file-loader-3.x

Update dependency file-loader to v3

package.json

@@ -12,7 +12,7 @@
     "classnames": "2.2.6",
     "css-loader": "2.1.0",
     "datepicker": "git+https://github.com/liqd/datePicker.git",
-    "file-loader": "1.1.11",
+    "file-loader": "3.0.1",
     "flatpickr": "4.5.5",
     "@fortawesome/fontawesome-free-webfonts": "1.0.9",
     "immutability-helper": "2.9.1",