[Bugfix] suggested filenames

[epaew]

Fixup suggested filenames in ESLint error message.

Before

$ eslint --ext .js,.ts src/utils/preset-case-converters.ts
src/utils/preset-case-converters.ts
  2:1  error  The filename must follow the rule: 'PascalCase'. Should rename to PresetCase-converters.ts  filenames-simple/naming-convention

with .eslintrc.yaml

---
plugins:
  - filenames-simple
rules:
  filenames-simple/naming-convention:
    - error
    - rule: PascalCase

After

$ eslint --ext .js,.ts src/utils/preset-case-converters.ts
src/utils/preset-case-converters.ts
  2:1  error  The filename must follow the rule: 'PascalCase'. Should rename to PresetCaseConverters.ts  filenames-simple/naming-convention