remove __future__ imports

[AurelienJaquier]

I only removed one line in each jupyter notebook, and it does not look like anything else has changed, when checking visually. @anilbey do you know why other lines have been unilateraly changed here?

[anilbey]

Nice change.

Yeah jupyter and git do these. Those differences must be created after you execute the cells.

[anilbey]

So I think if you git reset and then remove the lines and not execute the notebook cells then it should not add those.

[AurelienJaquier]

I actually did not execute the cells. I just removed the line, and saved in VScode.

[anilbey]

Oh, I see. Hmm if vscode did something and not displayed it, then the javascript lines can still be selected via git add -p PATH_TO_NOTEBOOK if you want to remove them.

[codecov-commenter]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (f7fd66d) 87.31% compared to head (8c8fb4b) 87.31%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #473 +/- ## ======================================= Coverage 87.31% 87.31% ======================================= Files 50 50 Lines 4336 4329 -7 ======================================= - Hits 3786 3780 -6 + Misses 550 549 -1 ``` | [Files](https://app.codecov.io/gh/BlueBrain/BluePyOpt/pull/473?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BlueBrain) | Coverage Δ | | |---|---|---| | [bluepyopt/deapext/tools/selIBEA.py](https://app.codecov.io/gh/BlueBrain/BluePyOpt/pull/473?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BlueBrain#diff-Ymx1ZXB5b3B0L2RlYXBleHQvdG9vbHMvc2VsSUJFQS5weQ==) | `100.00% <100.00%> (ø)` | | | [bluepyopt/ephys/serializer.py](https://app.codecov.io/gh/BlueBrain/BluePyOpt/pull/473?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BlueBrain#diff-Ymx1ZXB5b3B0L2VwaHlzL3NlcmlhbGl6ZXIucHk=) | `100.00% <ø> (ø)` | | | [bluepyopt/ipyp/bpopt\_tasksdb.py](https://app.codecov.io/gh/BlueBrain/BluePyOpt/pull/473?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BlueBrain#diff-Ymx1ZXB5b3B0L2lweXAvYnBvcHRfdGFza3NkYi5weQ==) | `0.00% <ø> (ø)` | |

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