feat: support no-override-exports

[atian25]

no-override-exports

A common mistake that newbee will make - override module.exports and exports.

exports.view = {};

module.exports = appInfo => {
  const config = exports = {};
  config.keys = '123456';
  return config;
}

eggjs/egg#2088

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@0f4f3ac). Click here to learn what that means.
The diff coverage is 100%.

@@           Coverage Diff           @@
##             master     #1   +/-   ##
=======================================
  Coverage          ?   100%           
=======================================
  Files             ?      1           
  Lines             ?     31           
  Branches          ?      0           
=======================================
  Hits              ?     31           
  Misses            ?      0           
  Partials          ?      0

Impacted Files	Coverage Δ
lib/rules/no-override-exports.js	100% <100%> (ø)

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