New Dart / Flutter `pubspec.yaml` reader and writer

Feature

Edit pubspec programmatically
- Including optional field like flutter-translate
Save and execute pub command
Field validation

BSD-3

Name		Name	Last commit message	Last commit date
Latest commit History 40 Commits
.github		.github
.vscode		.vscode
example		example
lib		lib
test		test
test_assets		test_assets
.gitignore		.gitignore
.licrc		.licrc
.pubignore		.pubignore
CHANGELOG.md		CHANGELOG.md
LICENSE		LICENSE
README.md		README.md
pubspec.yaml		pubspec.yaml