Removed array includes snippet (native JS alternative exists)

snippets/array-includes.md

@@ -1,11 +0,0 @@
-### Array includes
-
-Use `slice()` to offset the array/string and `indexOf()` to check if the value is included.
-Omit the last argument, `fromIndex`, to check the whole array/string.
-
-In [ES6](http://www.ecma-international.org/ecma-262/7.0/#sec-array.prototype.includes), you can use a similar native `.includes()` function.
-```js
-const includes = (collection, val, fromIndex=0) => collection.slice(fromIndex).indexOf(val) != -1;
-// includes("30-seconds-of-code", "code") -> true
-// includes([1, 2, 3, 4], [1, 2], 1) -> false
-```