Mark Array/String.includes() as allowed in the style guide
A follow-up CL to use this across the codebase is in
progress here: http://crrev.com/2768513002.
BUG=catapult:#3424
Review-Url: https://codereview.chromium.org/2764813005
diff --git a/docs/style-guide.md b/docs/style-guide.md
index 0f3a3fd..0b8d021 100644
--- a/docs/style-guide.md
+++ b/docs/style-guide.md
@@ -258,7 +258,7 @@
| Feature | Status |
|--------------------------|-----------------|
-| [Array.prototype.includes](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/includes) | To be discussed |
+| [Array.prototype.includes](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/includes) | [Approved](https://github.com/catapult-project/catapult/issues/3424) |
| [Exponentiation operator](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators#Exponentiation_(**)) | To be discussed |
### ECMAScript 2017 (ES8) features
