Bump version for proper semver

CHANGELOG.md

+## 5.0.0
+
+* semver mistake: 4.7.3 should have been a major bump as it involves breaking changes.
+
 ## 4.7.3
 
 * Simpler Install: Remove the need to specify the font in your own pubspec.yaml

pubspec.yaml

@@ -2,7 +2,7 @@ name: font_awesome_flutter
 description: The Font Awesome Icon pack available as Flutter Icons
 author: Brian Egan <brian@brianegan.com>
 homepage: https://github.com/brianegan/font_awesome_flutter
-version: 4.7.3
+version: 5.0.0
 
 dependencies:
   flutter: