Memory Test

[KatieWoe]

Due to phetsims/atomic-interactions#72 @ariel-phet asked for a quick memory leak test on 1 or 2 recently published sims. These are the results. I don't see anything concerning, but am still less familiar with what to expect. After examining feel free to close or ask me for more testing.
Start: 48.8 MB
1 min: 55.2
2 min: 56.1
3 min: 56.8
4 min: 57.2
5 min: 57.7
6 min: 57.9
7 min: 57.9
8 min: 58.3
9 min: 58.4
10 min: 58.6
30 min: 61.6

[Denz1994]

Memory Test: MacBook Pro, Chrome Version 70.0.3538.110

Each time stamp was a snapshot taken after the documented time interval.

Start: 51.1 MB
5 min: 58.5
10 min: 59.7
15 min: 60.5
20 min: 61.0
30 min: 61.0
45 min: 61.4
60 min: 61.3
60 min: 61.5

Total run time = 4hrs 5 min

I don't see anything alarming as well. Closing.