If you are going to do as you have in the past and report it as - Other Income (formerly line 21), you can still do that. Line 21, Other Income is still there, it has just been moved to Schedule 1 (line 8). To report the amount there, enter it under Less Common Income (last income section), Miscellaneous (last in the list). Then choose Hobby Income and Expenses.
[Edited 04/8/20 to update for current tax year]
