Update rand to 0.8

[codecov[bot]]

Codecov Report

All modified lines are covered by tests :white_check_mark:

Comparison is base (20407e3) 91.50% compared to head (a1c348b) 91.55%. Report is 2 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #144 +/- ## ========================================== + Coverage 91.50% 91.55% +0.04% ========================================== Files 79 79 Lines 7301 7341 +40 ========================================== + Hits 6681 6721 +40 Misses 620 620 ``` | [Files](https://app.codecov.io/gh/light-curve/light-curve-feature/pull/144?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=light-curve) | Coverage Δ | | |---|---|---| | [src/features/bazin\_fit.rs](https://app.codecov.io/gh/light-curve/light-curve-feature/pull/144?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=light-curve#diff-c3JjL2ZlYXR1cmVzL2JhemluX2ZpdC5ycw==) | `97.43% <100.00%> (+<0.01%)` | :arrow_up: | | [src/features/linexp\_fit.rs](https://app.codecov.io/gh/light-curve/light-curve-feature/pull/144?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=light-curve#diff-c3JjL2ZlYXR1cmVzL2xpbmV4cF9maXQucnM=) | `96.90% <100.00%> (+<0.01%)` | :arrow_up: | | [src/features/villar\_fit.rs](https://app.codecov.io/gh/light-curve/light-curve-feature/pull/144?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=light-curve#diff-c3JjL2ZlYXR1cmVzL3ZpbGxhcl9maXQucnM=) | `97.89% <100.00%> (+0.04%)` | :arrow_up: | | [src/nl\_fit/ceres.rs](https://app.codecov.io/gh/light-curve/light-curve-feature/pull/144?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=light-curve#diff-c3JjL25sX2ZpdC9jZXJlcy5ycw==) | `95.42% <100.00%> (+0.31%)` | :arrow_up: | | [src/nl\_fit/lmsder.rs](https://app.codecov.io/gh/light-curve/light-curve-feature/pull/144?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=light-curve#diff-c3JjL25sX2ZpdC9sbXNkZXIucnM=) | `93.98% <100.00%> (+0.22%)` | :arrow_up: | | [src/periodogram/mod.rs](https://app.codecov.io/gh/light-curve/light-curve-feature/pull/144?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=light-curve#diff-c3JjL3BlcmlvZG9ncmFtL21vZC5ycw==) | `100.00% <100.00%> (ø)` | |

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