BUGFIX: Fix handleReject (#47)

* Fix handleReject

By simply returning the error it changed the promise chain from rejected to resolved which was causing me issues.

* prettier issue

Author: Kent C. Dodds

src/useAsync.js

@@ -44,7 +44,7 @@ const useAsync = (arg1, arg2) => {
   const handleResolve = count => data =>
     count === counter.current && setData(data, () => onResolve && onResolve(data))
   const handleReject = count => error =>
-    count === counter.current && setError(error, () => onReject && onReject(error))
+    count === counter.current && Promise.reject(setError(error, () => onReject && onReject(error)))
 
   const start = promiseFn => {
     if ("AbortController" in window) {