fix linting issues

Author: Michael-Hanley

packages/react-bootstrap-table2/test/header-cell.test.js

@@ -393,7 +393,7 @@ describe('HeaderCell', () => {
     it('should have onClick event on header cell', () => {
       expect(wrapper.find('th').prop('onClick')).toBeDefined();
     });
-    
+
     it('should have onKeyUp event on header cell', () => {
       expect(wrapper.find('th').prop('onKeyUp')).toBeDefined();
     });
@@ -404,12 +404,12 @@ describe('HeaderCell', () => {
     });
 
     it('should trigger onSort callback when keyup Enter on header cell', () => {
-      wrapper.find('th').simulate('keyup', {key: 'Enter'});
+      wrapper.find('th').simulate('keyup', { key: 'Enter' });
       expect(onSortCallBack.callCount).toBe(1);
     });
 
     it('should not trigger onSort callback when keyup key is not Enter on header cell', () => {
-      wrapper.find('th').simulate('keyup', {key: 'test-key'});
+      wrapper.find('th').simulate('keyup', { key: 'test-key' });
       expect(onSortCallBack.callCount).toBe(0);
     });