Fix typos

Suggest by @juergba at #4164

Author: UlisesGascon

.eslintrc.yml

@@ -76,7 +76,7 @@ overrides:
   - files:
       - test/**/*.mjs
     parserOptions:
-      ecmaVersion: 2017
+      ecmaVersion: 2018
       sourceType: module
 
   - files:

docs/index.md

@@ -98,7 +98,7 @@ or as a development dependency for your project:
 $ npm install --save-dev mocha
 ```
 
-> As of v7.0.0, Mocha requires Node.js v10.0.0 or newer.
+> As of v8.0.0, Mocha requires Node.js v10.0.0 or newer.
 
 ## Getting Started