[Update] Modify README

README.md

@@ -6,7 +6,7 @@
 
 A JavaScript interpreter writen in JavaScript, based on parser [Acorn](https://github.com/acornjs/acorn).
 
-- **Running on ES5, supporting ES5/6/7/8 full features**
+- **Running on ES5, supporting ES5/6/7/8/9/10 full features**
 - **Both invasived and sandbox modes available**
 
 It's useful to evaluate the code of higher ECMAScript editions, or for the environment with disabled `eval`, `setTimeout` and `new Function`.
@@ -38,8 +38,8 @@ import Sval from 'sval'
 
 // Sval options
 const options = {
-  // ECMA Version of the code (5 | 6 | 7 | 8 | 2015 | 2016 | 2017)
-  ecmaVer: 7,
+  // ECMA Version of the code (5 | 6 | 7 | 8 | 9 | 10 | 2015 | 2016 | 2017 | 2018 | 2019)
+  ecmaVer: 9,
   // Whether the code runs in a sandbox
   sandBox: true,
 }