v0.2.0

Breaking changes

• 3ce4590 Use Box<dyn Error> for Runner methods.
• fe62af3 Default to "ok" for command blocks that don't yield any output.
• c98db05 Mark Command and Argument as non_exhaustive, to allow extending them.

Improvements

• 51c34d9 Relax dependency version requirements.
• f911c66 Add generate() to generate output for a goldenscript input.
• 5f49b9d Add Argument.parse() to parse values into e.g. integers or booleans.
• cc0936f Add Command.line_number with the command's position in the script.
• cc0936f Add Runner error context such as the command or hook name and line number.
• 456ae1b Make parse errors more concise.