tools: update dotfile whitelist in .gitignore
.eslintrc was renamed in #7699 to .eslintrc.yaml.
Refs: https://github.com/nodejs/node/pull/7699
Checklist
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commit message follows commit guidelines
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
.eslintrc was renamed in #7699 to .eslintrc.yaml.
Refs: https://github.com/nodejs/node/pull/7699