"do not have an ESLint equivalent" is misleading

[JoshuaKGoldberg]

🐛 Bug Report

• tslint-to-eslint-config version: 0.4.0
• ESLint version: N/A
• Node version: N/A

Actual Behavior

When a TSLint configuration contains a rule not recognized by tslint-to-eslint-config, the message is in the format:

some-tslint-rule does not yet have an ESLint equivalent

This is actually kind of misleading; the issue could alternately be that this tool doesn't yet know of the ESLint equivalent. 🙁

Expected Behavior

The messaging should be something like, maybe...

tslint-to-eslint-config does not know the ESLint equivalent for TSLint's some-tslint-rule

Reproduction

Create a tslint.json file with:

{
    "rules": { "my-custom-rule": true }
}

Then run:

npx tslint-to-eslint-config@0.4.0