v2.0.0

This is a major release which makes significant changes to the behavior of the library when run as a module, and the available options.

• VERSION: 2.0.0
• CHANGE: remove mappings option
• CHANGE: remove postprocessor option
• CHANGE: remove transforms option
• CHANGE: the library now returns a Promise that resolves to an Array of entries rather than a Stream (#34)
• NEW: option: pretty (outputs pretty JSON) (#24)
• FIX: test for parseError option does not have any expectations (#19)
• DOCS: add prerequisites to the README (#21)
• DEV: use cache during test workflow (#22)