Initial vendor packages

Signed-off-by: Valentin Popov <valentin@popov.link>

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+# Release 0.4.1 (2022-06-23)
+
+- [Fewer `clone` calls are used when reducing a new `Ratio<T>`][98].
+- [Conversions to floating point are better at avoiding underflow][104].
+- [`Ratio<T>` now implements `Default`][105], returning a zero value.
+
+**Contributors**: @cuviper, @lemmih, @MattX
+
+[98]: https://github.com/rust-num/num-rational/pull/98
+[104]: https://github.com/rust-num/num-rational/pull/104
+[105]: https://github.com/rust-num/num-rational/pull/105
+
+# Release 0.4.0 (2021-03-05)
+
+- The optional `num-bigint` dependency is now 0.4.
+- [The `Rational` alias for `Ratio<usize>` is now deprecated][92]. It is
+  recommended to use specific type sizes for numeric computation, like
+  `Rational32` and `Rational64`.
+
+**Contributors**: @cuviper, @vks
+
+[92]: https://github.com/rust-num/num-rational/pull/92
+
+# Release 0.3.2 (2020-11-06)
+
+- [Fix always rebuilding with --remap-path-prefix][88]
+
+**Contributors**: @Nemo157
+
+[88]: https://github.com/rust-num/num-rational/pull/88
+
+# Release 0.3.1 (2020-10-29)
+
+- [Handle to_f64() with raw division by zero][83].
+- [Better document panic behaviour][84].
+- Clarify the license specification as "MIT OR Apache-2.0".
+
+**Contributors**: @cuviper, @zetok
+
+[83]: https://github.com/rust-num/num-rational/pull/83
+[84]: https://github.com/rust-num/num-rational/pull/84
+
+# Release 0.3.0 (2020-06-13)
+
+### Enhancements
+
+- [`Ratio` now implements `ToPrimitive`][52].
+- [`Ratio` now implements additional formatting traits][56]:
+  - `Binary`, `Octal`, `LowerHex`, `UpperHex`, `LowerExp`, `UpperExp`
+- [The `Pow` implementations have been expanded][70].
+  - `Pow<BigInt>` and `Pow<BigUint>` are now implemented.
+  - `Pow<_> for &Ratio<T>` now uses `&T: Pow`.
+  - The inherent `pow` method now uses `&T: Pow`.
+
+### Breaking Changes
+
+- [`num-rational` now requires Rust 1.31 or greater][66].
+  - The "i128" opt-in feature was removed, now always available.
+- [The "num-bigint-std" feature replaces "bigint" with `std` enabled][80].
+  - The "num-bigint" feature without `std` uses `alloc` on Rust 1.36+.
+
+**Contributors**: @cuviper, @MattX, @maxbla
+
+[52]: https://github.com/rust-num/num-rational/pull/52
+[56]: https://github.com/rust-num/num-rational/pull/56
+[66]: https://github.com/rust-num/num-rational/pull/66
+[70]: https://github.com/rust-num/num-rational/pull/70
+[80]: https://github.com/rust-num/num-rational/pull/80
+
+# Release 0.2.4 (2020-03-17)
+
+- [Fixed `CheckedDiv` when both dividend and divisor are 0][74].
+- [Fixed `CheckedDiv` with `min_value()` numerators][76].
+
+[74]: https://github.com/rust-num/num-rational/pull/74
+[76]: https://github.com/rust-num/num-rational/pull/76
+
+# Release 0.2.3 (2020-01-09)
+
+- [`Ratio` now performs earlier reductions to avoid overflow with `+-*/%` operators][42].
+- [`Ratio::{new_raw, numer, denom}` are now `const fn` for Rust 1.31 and later][48].
+- [Updated the `autocfg` build dependency to 1.0][63].
+
+**Contributors**: @cuviper, @dingelish, @jimbo1qaz, @maxbla
+
+[42]: https://github.com/rust-num/num-rational/pull/42
+[48]: https://github.com/rust-num/num-rational/pull/48
+[63]: https://github.com/rust-num/num-rational/pull/63
+
+# Release 0.2.2 (2019-06-10)
+
+- [`Ratio` now implements `Zero::set_zero` and `One::set_one`][47].
+
+**Contributors**: @cuviper, @ignatenkobrain, @vks
+
+[47]: https://github.com/rust-num/num-rational/pull/47
+
+# Release 0.2.1 (2018-06-22)
+
+- Maintenance release to fix `html_root_url`.
+
+# Release 0.2.0 (2018-06-19)
+
+### Enhancements
+
+- [`Ratio` now implements `One::is_one` and the `Inv` trait][19].
+- [`Ratio` now implements `Sum` and `Product`][25].
+- [`Ratio` now supports `i128` and `u128` components][29] with Rust 1.26+.
+- [`Ratio` now implements the `Pow` trait][21].
+
+### Breaking Changes
+
+- [`num-rational` now requires rustc 1.15 or greater][18].
+- [There is now a `std` feature][23], enabled by default, along with the
+  implication that building *without* this feature makes this a `#![no_std]`
+  crate.  A few methods now require `FloatCore` instead of `Float`.
+- [The `serde` dependency has been updated to 1.0][24], and `rustc-serialize`
+  is no longer supported by `num-rational`.
+- The optional `num-bigint` dependency has been updated to 0.2, and should be
+  enabled using the `bigint-std` feature.  In the future, it may be possible
+  to use the `bigint` feature with `no_std`.
+
+**Contributors**: @clarcharr, @cuviper, @Emerentius, @robomancer-or, @vks
+
+[18]: https://github.com/rust-num/num-rational/pull/18
+[19]: https://github.com/rust-num/num-rational/pull/19
+[21]: https://github.com/rust-num/num-rational/pull/21
+[23]: https://github.com/rust-num/num-rational/pull/23
+[24]: https://github.com/rust-num/num-rational/pull/24
+[25]: https://github.com/rust-num/num-rational/pull/25
+[29]: https://github.com/rust-num/num-rational/pull/29
+
+
+# Release 0.1.42 (2018-02-08)
+
+- Maintenance release to update dependencies.
+
+
+# Release 0.1.41 (2018-01-26)
+
+- [num-rational now has its own source repository][num-356] at [rust-num/num-rational][home].
+- [`Ratio` now implements `CheckedAdd`, `CheckedSub`, `CheckedMul`, and `CheckedDiv`][11].
+- [`Ratio` now implements `AddAssign`, `SubAssign`, `MulAssign`, `DivAssign`, and `RemAssign`][12]
+  with either `Ratio` or an integer on the right side.  The non-assignment operators now also
+  accept integers as an operand.
+- [`Ratio` operators now make fewer `clone()` calls][14].
+
+Thanks to @c410-f3r, @cuviper, and @psimonyi for their contributions!
+
+[home]: https://github.com/rust-num/num-rational
+[num-356]: https://github.com/rust-num/num/pull/356
+[11]: https://github.com/rust-num/num-rational/pull/11
+[12]: https://github.com/rust-num/num-rational/pull/12
+[14]: https://github.com/rust-num/num-rational/pull/14
+
+
+# Prior releases
+
+No prior release notes were kept.  Thanks all the same to the many
+contributors that have made this crate what it is!