• Add command line tool with syntax check and JSON export
• Add export method for exporting values to the process environment

• Move free functions inside a new type, DotEnvironment, or inside the error types.
• Add tools for loading the default .env file and for combining it with the process environment.
• Add more documentation.
• Fix handling of escaped double quote in an unquoted value.
• Fix handling of file not found on non-Darwin platforms.

• Match python-dotenv's escape sequence handling.
• Add more doc comments.
• Fix example in README.

First tagged release.