chore(deps): update dependency mocha to v6 (#269)

Author: renovate[bot]

compute/package.json

@@ -23,7 +23,7 @@
   "devDependencies": {
     "chai": "^4.2.0",
     "execa": "^1.0.0",
-    "mocha": "^5.0.0",
+    "mocha": "^6.0.0",
     "proxyquire": "^2.0.1",
     "uuid": "^3.2.1"
   }