Fix README.

Author: RobThree

README.md

@@ -29,7 +29,7 @@ By default the `FeedReader` suppresses exceptions (since feeds tend to go down o
 
 The `FeedReader` also accepts an optional `FeedNormalizer` (needs to implement the `IFeedItemNormalizer` interface). This "normalizer" can transform or otherwise affect the way [`SyndicationItem`](http://msdn.microsoft.com/en-us/library/system.servicemodel.syndication.syndicationitem.aspx)s are transformed into `FeedItem`s. The `FeedItem` is the basic object retrieved from feeds and, for simplicity, contains only a few simple properties and methods. It has `Title`, `Summary`, `Content`, `Uri` , `PublishDate`, `LastUpdatedDate`, `Images` and `Categories` properties and that's about it. The default `DefaultFeedItemNormalizer` strips and decodes any HTML in the `Title`, `Summary`, `Content` to (try to) reliably return plain text only. The `Date` property will be populated with whatever the `SyndicationItem`'s latest date is: the `PublishDate` or `LastUpdatedTime`.
 
-You can implement your own `IFeedItemNormalizer` (see the [UnitTest project](https://github.com/RobThree/SimpleFeedReader/tree/master/SimpleFeedReaderTests) for examples) to handle 'normalization' differently to your desire. The `FeedReader` has some convienience methods like `RetrieveFeeds()` that retrieve more than one feed.
+You can implement your own `IFeedItemNormalizer` (see the [UnitTest project](https://github.com/RobThree/SimpleFeedReader/tree/master/SimpleFeedReaderTests) for examples) to handle 'normalization' differently to your desire. The `FeedReader` has some convienience methods like `RetrieveFeedsAsync()` that retrieve more than one feed.
 
 The project is aimed at easy, don't-make-me-think, retrieval of syndication feeds' entries. It is by no means intended as full-fledged feedreader. It is, however, easily extensible for your purposes (again, see the [UnitTest project](https://github.com/RobThree/SimpleFeedReader/tree/master/SimpleFeedReaderTests) for examples; the `ExtendedFeedItem` and `ExtendedFeedItemNormalizer` are nice concrete examples of this idea).