fix mini typo (#1559)

fix mini typo
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Alexey Pyltsyn 2019-11-01 01:16:13 +03:00 committed by GitHub
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@ -7,7 +7,7 @@ So we can create new functionality on top of the existing.
## The "extends" keyword
Let's say with have class `Animal`:
Let's say we have class `Animal`:
```js
class Animal {