Make Yoga lowercase in Podfile

[hassanbazzi]

Summary

When doing RN init from scratch for 0.61, I noticed pod install was failing. This was because "yoga" was mis-spelled to "Yoga" in the podfile. Thus, it couldn't find the podspec file.

[!] No podspec found for `Yoga` in `../node_modules/react-native/ReactCommon/yoga

Changelog

iOS [Fixed] - Fix yoga case sensitivity in PodFile to match PodSpec

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[hassanbazzi]

Whoops. Wrong change.

[pull-bot]

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