feat(stats): verify case-insentive to null nickname

[m9tzin]

src/routes/stats.js: Tratamos null e undefined (com trim e comparação case-insensitive) como “nickname ausente”, e devolvemos a mesma mensagem de 200 e texto: Indique o nickname FACEIT (ex.: !stats s1mple).
README.md: Documentação do endpoint GET /stats atualizada para o comportamento do Nightbot e com exemplo de curl para ?player=null (mesmo aviso do caso sem player).

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• README.md
• src/routes/stats.js

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