sha_env 3.0.0

Yet another DotEnv handling library for Dart but all the other gave me headaches.

3.0.0

• Complete rework of the package.
• Added support for comments.
• Added support for inferring values from other environment variables.
• Added support for loading environment variables from a file.
• Added examples.
• Added tests.
• Added documentation.
• Migrated to gitlab.com
• Added CI/CD pipeline.

0.0.1

• Initial version.