fix(deps): update module iris-contrib/middleware/cors to v12 - autoclosed

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
iris-contrib/middleware/cors	require	major	v0.0.0-20191219204441-78279b78a367 -> v12.1.2

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Release Notes

iris-contrib/middleware

### [`v12.1.2`](https://togithub.com/iris-contrib/middleware/releases/v12.1.2) [Compare Source](https://togithub.com/iris-contrib/middleware/compare/v12.1.1...v12.1.2) Fix a go.mod parsing issue (last require parenthesis missing) caused by previous commit. ### [`v12.1.1`](https://togithub.com/iris-contrib/middleware/releases/v12.1.1) [Compare Source](https://togithub.com/iris-contrib/middleware/compare/v12.1.0...v12.1.1) Update go.mod files for [Iris version 12.1.1](https://togithub.com/kataras/iris/blob/master/HISTORY.md#mo-16-december-2019--v1211).

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