Mocha v9 (#354)

* [email protected]

* Replace deprecated mocha.opts

Ref: mochajs/mocha#4175

* Remove dependabot exclusion

Author: bpinto

.github/dependabot.yml

@@ -6,11 +6,6 @@ updates:
     interval: daily
   open-pull-requests-limit: 10
   ignore:
-  - dependency-name: mocha
-    versions:
-    - 8.2.1
-    - 8.3.0
-    - 8.3.1
   - dependency-name: typescript
     versions:
     - 4.1.3

.mocharc.json

@@ -0,0 +1,5 @@
+{
+  "reporter": "spec",
+  "require": "@babel/register",
+  "ui": "bdd"
+}