Merge pull request #335 from textpattern/greenkeeper/fibers-3.1.1

Update fibers to the latest version 🚀

Author: philwareham

package.json

@@ -31,7 +31,7 @@
     "cross-env": "5.2.0",
     "css-loader": "1.0.1",
     "dart-sass": "1.15.1",
-    "fibers": "3.1.0",
+    "fibers": "3.1.1",
     "file-loader": "2.0.0",
     "mini-css-extract-plugin": "0.4.5",
     "postcss-loader": "3.0.0",