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- Update optics-core to version 0.4.
[#] optics-core-0.4 (2021-02-22)
* See [migration-guide-0.4.md](https://github.com/well-typed/optics/blob/master/migration-guide-0.4.md) for more details
* Add support for GHC-9.0
* Drop support for GHC-8.0
* The `FunctorWithIndex`, `FoldableWithIndex` and `TraversableWithIndex` type
classes have been migrated to a new package,
[`indexed-traversable`](https://hackage.haskell.org/package/indexed-traversable)
([#370](https://github.com/well-typed/optics/pull/370))
* Add `adjoin`, `iadjoin` and `both` to `Optics.[Ix]Traversal`
([#332](https://github.com/well-typed/optics/pull/332),
[#372](https://github.com/well-typed/optics/pull/372))
* Add `ifst` and `isnd` to `Optics.IxLens`
([#389](https://github.com/well-typed/optics/pull/389))
* Generalize types of `generic`
([#376](https://github.com/well-typed/optics/pull/376))
* Make `chosen` an indexed lens to see which value is traversed
([#335](https://github.com/well-typed/optics/pull/335))
* Remove `GeneralLabelOptic` extensibility mechanism
([#361](https://github.com/well-typed/optics/pull/361))
* Add `gfield`, `gafield`, `gconstructor`, `gposition` and `gplate` for
generics-based data access
([#358](https://github.com/well-typed/optics/pull/358),
[#361](https://github.com/well-typed/optics/pull/361))
* Add support for generics-based field lenses and constructor prisms (`gfield`
and `gconstructor`) to `LabelOptic` so they can be used via `OverloadedLabels`
([#361](https://github.com/well-typed/optics/pull/361))
* Remove unnecessary INLINE pragmas to reduce compile times
([#394](https://github.com/well-typed/optics/pull/394))
* Simplify the type of `(%)` using new `JoinKinds` and `AppendIndices` classes
in place of the `Join` and `Append` type families
([#397](https://github.com/well-typed/optics/pull/397),
[#399](https://github.com/well-typed/optics/pull/399))
- disable %{ix86} build
- Add optics-core at version 0.3.0.1.