Asserts limit do not detect "Sinon" camelcase

[ymoreiratiti]

Somente tests where Sinon is imported with the name "Sinon" instead "sinon" returns Test without assertions is not allowed.

e.g.

const rule = require('../../../lib/rules/asserts-limit');
const { RuleTester } = require('eslint');

const ruleTester = new RuleTester({ env: { es6: true } });

ruleTester.run('asserts-limit', rule, {
  valid: [
    {
      only: true,
      code: `it('1234', function () {
        Sinon.assert.calledOn(sp, {});
      })`
    }
  ],
  invalid: [],
});

It appears that changing lib/utils/node.js#L36
from node.object.name === 'sinon' to String(node.object.name).toLowerCase() === 'sinon' solves.