Adds 1.2.0 release summary post (#154)

content/blog/2023-04-04-arrow-1-2-0-rc-summary.md

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+---
+title: Arrow 1.2.0-RC Release Summary 
+image: https://xebia.com/wp-content/uploads/2023/04/arrow-1-2-0-rc-twitter.jpg
+category: articles
+tags: [core, articles]
+link: https://xebia.com/blog/arrow-1-2-0-rc-is-now-available/
+---
+
+# Arrow 1.2.0-RC Release Summary
+
+We're excited to announce Arrow 1.2.0-RC alongside a new Arrow website. To briefly summarize, this release:
+
+- Introduces a brand new [typed errors](http://arrow-kt.io/learn/typed-errors/working-with-typed-errors/) module.
+- Adds more options for [resilience](http://arrow-kt.io/learn/resilience/).
+- Marks every function and type we intend to remove in 2.0 as `@Deprecated`.
+
+Read more details in the full [Arrow 1.2.0 release announcement](https://xebia.com/blog/arrow-1-2-0-rc-is-now-available/).