updated readme.md
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@ -93,7 +93,15 @@ Note: `is.number(NaN)` returns `false`. This intentionally deviates from `typeof
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#### Built-in types
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##### .array(value)
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##### .array(value, assertion)
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Returns true if `value` is an array and all of it's items match the assertion.
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```js
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is.array(value) // validate `value` is an array
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is.array(value, is.number) // validate that value is an array and all of it's items are numbers.
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```
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##### .function(value)
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##### .buffer(value)
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##### .object(value)
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