Sara Tavares

Fixing typos on README.md 🔨

Minor suggestion on README.md 🔨

Update README.md :rocket:

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## Checklist - [x] I checked the [**Contributing Guidelines**](https://github.com/SwifterSwift/SwifterSwift/blob/master/CONTRIBUTING.md) before creating this request. - [ ] New extensions are written in Swift 5.0. - [ ] New extensions support iOS...

Update README_CN.md 🚀

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## Checklist - [x] I checked the [**Contributing Guidelines**](https://github.com/SwifterSwift/SwifterSwift/blob/master/CONTRIBUTING.md) before creating this request. - [ ] New extensions are written in Swift 5.0. - [ ] New extensions support iOS...

What this PR does: adds leak canary to check memory leaks as a suggestion https://square.github.io/leakcanary/ when compiling, you can check the leaks going to the leaks extension here

Fix minor typo on README.md

Fix typos 🔨

Fix typos 🔨