docs: readme: built-int -> built-in (#220)

Author: orta

README.md

@@ -456,7 +456,7 @@ It looks this way in [**ESTree**](https://github.com/estree/estree) **JavaScript
 
 With help of [processors](https://github.com/coderaiser/putout/blob/master/packages/engine-processor#readme) 🐊**Putout** can be extended to read any file format and parse **JavaScript** from there.
 
-Here is a list of built-int processors:
+Here is a list of built-in processors:
 
 | Package | Version |
 |--------|-------|