Merge pull request #24 from dyspop/master

update mocha to version 9

Author: Tom Boutell

package.json

@@ -22,6 +22,6 @@
   "author": "Thomas Boutell",
   "license": "MIT",
   "devDependencies": {
-    "mocha": "^7.1.1"
+    "mocha": "^9.1.3"
   }
 }