bump version to 1.3.0 in pubspec.yaml

Author: warioddly

pubspec.yaml

@@ -4,7 +4,7 @@ repository: "https://github.com/warioddly/graphify"
 documentation: "https://echarts.apache.org/en/option.html#title"
 issue_tracker: "https://github.com/warioddly/graphify/issues"
 
-version: 1.1.2
+version: 1.3.0
 
 environment:
   sdk: '>=3.2.3 <4.0.0'
@@ -21,10 +21,6 @@ dev_dependencies:
     sdk: flutter
   flutter_lints: ^3.0.1
 
-# For information on the generic Dart part of this file, see the
-# following page: https://dart.dev/tools/pub/pubspec
-
-# The following section is specific to Flutter packages.
 flutter:
   # This section identifies this Flutter project as a plugin project.
   # The 'pluginClass' specifies the class (in Java, Kotlin, Swift, Objective-C, etc.)