[eslint config] [base] [breaking] Update object-curly-newline to ma…

…tch eslint 4.18.0

In eslint v4.18.0 separate settings are introduced for imports and exports for the `object-curly-newline` rule.

Without this change, there is different behavior when updating eslint to this version.

packages/eslint-config-airbnb-base/rules/style.js

@@ -383,7 +383,9 @@ module.exports = {
     // https://eslint.org/docs/rules/object-curly-newline
     'object-curly-newline': ['error', {
       ObjectExpression: { minProperties: 4, multiline: true, consistent: true },
-      ObjectPattern: { minProperties: 4, multiline: true, consistent: true }
+      ObjectPattern: { minProperties: 4, multiline: true, consistent: true },
+      ImportDeclaration: { minProperties: 4, multiline: true, consistent: true },
+      ExportDeclaration: { minProperties: 4, multiline: true, consistent: true },
     }],
 
     // enforce "same line" or "multiple line" on object properties.