Changes version to v1.3.0 (#13)

Author: onstash

pubspec.yaml

@@ -7,7 +7,7 @@ description: A new Flutter application.
 # Both the version and the builder number may be overridden in flutter
 # build by specifying --build-name and --build-number, respectively.
 # Read more about versioning at semver.org.
-version: 1.0.0+1
+version: 1.3.0+1
 
 environment:
   sdk: ">=2.0.0-dev.68.0 <3.0.0"