1.4.1

Fix issues with naming and paths

What's Changed

• add opi field to definitions by @gilesknap in #122
• Add an opi field to definitions by @gilesknap in #121
• tidy up dependencies and settings by @gilesknap in #124
• remove intermediate 'root' object in discriminated union by @gilesknap in #125
• tidy up of naming conventions by @gilesknap in #127

Full Changelog: 1.4.0...1.4.1