Some improvements collection

[JulianCataldo]

Refs

• Add retext-case-police to list of plugins retextjs/retext#78 (comment)

• Add retext-case-police to list of plugins retextjs/retext#78 (comment)

Summary

• Add URL and suggestions
• Better message
• Ignore options
• Better text checking like case-police (using node[0] instead of node[0].children[0]
• Custom dict?

Notes

if (nodes[0].type === 'WordNode') makes ESLint happy (no behavior change)