2.0.4 - Inject versions and be friendly

Commits:

• 🖊️ style touchups 2a275e1
• 🔺 don't fail on missing check functions (#197) 3641d3a
• ♥️ improve plugin flow and tests (#196) eb8020d
• feat: inject versions into friendly errors (#195) d5ed9d4
• Merge branch 'master' of github.com:infinitered/solidarity dfe8fd8
• simplify readme 540d8a3