chore: revert back to Mocha 4

Mocha 5+ dropped support for IE 8 and IE 9. This leads to failing BrowserStack tests, so reverting back to version 4 until Karma decides to drop support for the mentioned browsers.
karma-runner · May 23, 2019 · 386805c · 386805c
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commit 386805c
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diff --git a/package.json b/package.json
@@ -450,7 +450,7 @@
     "karma-script-launcher": "^1.0.0",
     "load-grunt-tasks": "^4.0.0",
     "mkdirp": "^0.5.0",
-    "mocha": "^6.1.4",
+    "mocha": "^4.1.0",
     "mocks": "^0.0.15",
     "proxyquire": "^2.1.0",
     "puppeteer": "^1.9.0",