Mention source of elements database in docstring
#276
| Job | Run time |
|---|---|
| 3m 37s | |
| 3m 42s | |
| 3m 41s | |
| 3m 8s | |
| 4m 12s | |
| 4m 12s | |
| 4m 59s | |
| 4m 39s | |
| 3m 21s | |
| 5m 11s | |
| 2m 31s | |
| 2m 45s | |
| 4m 29s | |
| 4m 29s | |
| 3m 44s | |
| 2m 55s | |
| 3m 56s | |
| 4m 7s | |
| 2m 51s | |
| 2m 49s | |
| 1h 15m 18s |