Relax no-cond-assign rule (#3716)

Fixes #2793

Author: gaearon

packages/eslint-config-react-app/index.js

@@ -116,7 +116,7 @@ module.exports = {
  'new-parens': 'warn',
  'no-array-constructor': 'warn',
  'no-caller': 'warn',
- 'no-cond-assign': ['warn', 'always'],
+ 'no-cond-assign': ['warn', 'except-parens'],
  'no-const-assign': 'warn',
  'no-control-regex': 'warn',
  'no-delete-var': 'warn',