Merge pull request #178 from izayl/patch-1

fix(docs): miss braces

README.md

@@ -941,7 +941,7 @@ When using `wretch`, please be mindful of this limitation and avoid setting the
 
 ```js
 wretch(url)
- .headers("content-type": "application/json")
+ .headers({ "content-type": "application/json" })
  // .json is a shortcut for .headers("Content-Type": "application/json").post().json()
  .json({ foo: "bar" })
  // Wretch stores the headers inside a plain javascript object and will not deduplicate them.