bump version

pubspec.yaml

@@ -1,5 +1,5 @@
 name: webfeed
-version: 0.4.2
+version: 0.4.3
 description: webfeed is a dart package for parsing RSS and Atom feeds. Media & DublinCore namespaces are also supported.
 author: Wito Chandra <wito.c.91@gmail.com>
 homepage: https://github.com/witochandra/webfeed