Fix pubspec.yaml homepage key (#55)

Author: lcdsmao

pubspec.yaml

@@ -1,7 +1,7 @@
 name: flutter_gen
 description: The Flutter code generator for your assets, fonts, colors, … — Get rid of all String-based APIs.
 version: 1.2.2
-komepage: https://github.com/FlutterGen/flutter_gen
+homepage: https://github.com/FlutterGen/flutter_gen
 repository: https://github.com/FlutterGen/flutter_gen
 documentation: https://github.com/FlutterGen/flutter_gen
 issue_tracker: https://github.com/FlutterGen/flutter_gen/issues