build(eslint): disallow exclusive tests

.eslintrc.json

 {
   "rules": {
+    "mocha/no-exclusive-tests": "error",
+    "mocha/no-skipped-tests": "warn",
+
     "no-console": "off",
     "no-extra-parens": "warn",
     "valid-jsdoc": "off",
@@ -42,6 +45,9 @@
     "ecmaVersion": 6,
     "sourceType": "script"
   },
+  "plugins": [
+    "mocha"
+  ],
   "env": {
     "node": true,
     "mocha": true,

package.json

@@ -67,6 +67,7 @@
     "env-cmd": "^7.0.0",
     "esdoc": "^0.5.2",
     "eslint": "^4.6.0",
+    "eslint-plugin-mocha": "^4.11.0",
     "hints": "^1.1.0",
     "husky": "^0.14.2",
     "istanbul": "^0.4.5",