Update of minor things

[llaniewski]

This PR:

• updates the contributor list and corrects the README.md
• removes numbers package from dependencies, as several users had problem with it (and it was used only for GCD)
• makes codecov not fail on reduced coverage

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (5f9d594) 32.52% compared to head (e36906b) 32.52%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #433 +/- ## ======================================== Coverage 32.52% 32.52% ======================================== Files 152 152 Lines 6453 6453 ======================================== Hits 2099 2099 Misses 4354 4354 ``` | Flag | Coverage Δ | | |---|---|---| | d2q9 | `30.45% <ø> (ø)` | | | d2q9_bc | `26.73% <ø> (ø)` | | | d2q9_kuper | `27.58% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=CFD-GO#carryforward-flags-in-the-pull-request-comment) to find out more.

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