Bump rayon from 1.2.0 to 1.2.1

Bumps rayon from 1.2.0 to 1.2.1.

Changelog

*Sourced from [rayon's changelog](https://github.com/rayon-rs/rayon/blob/master/RELEASES.md).* > # Release rayon 1.2.1 / rayon-core 1.6.1 (2019-11-20) > > - Update crossbeam dependencies. > - Add top-level doc links for the iterator traits. > - Document that the iterator traits are not object safe. > > ## Contributors > > Thanks to all of the contributors for this release! > > - [@cuviper](https://github.com/cuviper) > - [@dnaka91](https://github.com/dnaka91) > - [@matklad](https://github.com/matklad) > - [@nikomatsakis](https://github.com/nikomatsakis) > - [@Qqwy](https://github.com/Qqwy) > - [@vorner](https://github.com/vorner)

Commits

- [`89849ed`](https://github.com/rayon-rs/rayon/commit/89849edbce826e9abc4ec1be4b113bcfc63ca7e6) bump rayon-core to add licenses - [`e40824b`](https://github.com/rayon-rs/rayon/commit/e40824b27e9e81ec5dee22306ae88dedee38587c) Merge pull request [#375](https://github-redirect.dependabot.com/rayon-rs/rayon/issues/375) from nikomatsakis/add-license - [`1399c32`](https://github.com/rayon-rs/rayon/commit/1399c3248e3ada74844aafb7752e659cee88e771) add LICENSE files to rayon-core - [`c95b859`](https://github.com/rayon-rs/rayon/commit/c95b859221bd01ded6ffb654e7173481b4ad25e2) Merge pull request [#373](https://github-redirect.dependabot.com/rayon-rs/rayon/issues/373) from nikomatsakis/rayon-v0.8.1 - [`f3bc71c`](https://github.com/rayon-rs/rayon/commit/f3bc71cc4bfcabecf0f1b3e1f4e52bf039a95bac) release rayon 0.8.1, rayon-core 1.2.0 - [`248113e`](https://github.com/rayon-rs/rayon/commit/248113e6f17dafbecc2c94b18997edb413579086) Merge pull request [#371](https://github-redirect.dependabot.com/rayon-rs/rayon/issues/371) from nikomatsakis/stabilize-spawn-async-etc - [`3033081`](https://github.com/rayon-rs/rayon/commit/30330812312b9fd56e42b1b9f4513a9f24c3de5b) Merge pull request [#368](https://github-redirect.dependabot.com/rayon-rs/rayon/issues/368) from nikomatsakis/semver-policy - [`e1b4d8a`](https://github.com/rayon-rs/rayon/commit/e1b4d8a78da744d1a96c6d6943cc175dbb2e4115) Stabilize a number of APIs: - [`20de1ff`](https://github.com/rayon-rs/rayon/commit/20de1ff12df93c739152e5ccfe48a91a66adac99) adopt new approach to unstable features - [`49a9c9d`](https://github.com/rayon-rs/rayon/commit/49a9c9d58c5527f7457b21da645c4c9d12c50d6d) Merge pull request [#372](https://github-redirect.dependabot.com/rayon-rs/rayon/issues/372) from raviqqe/fix-a-typo - Additional commits viewable in [compare view](https://github.com/rayon-rs/rayon/compare/v1.2.0...rayon-core-v1.2.1)

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mp4096 / indentex

Bump rayon from 1.2.0 to 1.2.1 #64