opt_reduce 1.0.0

`reduce` function for `Option<_>`
Documentation 
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  <h1>opt_reduce</h1>

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This crate provides a `reduce` function for `Option<_>` that allows to
merge two options together.

This method was previously proposed for addition to `std` two times but both
PRs were closed:
1. [#84695][first PR]
2. [#87036][second PR]

[first PR]: https://github.com/rust-lang/rust/pull/84695
[second PR]: https://github.com/rust-lang/rust/pull/87036

---

```toml
opt_reduce = "1"
```
_Compiler support: requires rustc 1.31+_.