Last cell keeps on loading

@mrigankgupta 
In grid collection view having 3 cell in a row, the last cell keeps on loading  when page 2 (It is the last page) response can be fitted to the visible area without scrolling. I have reproduced this bug in example project as well. Give fixed height for row in tableview i.e. 20 
```tableView.rowHeight = 20```
And the last cell keeps on loading. 
Tested in iphone X