Upgrade RN version to 0.63.0

[sanjeevyadavIT]

Is your feature request related to a problem? Please describe.
Upgrade React Native version to 0.63.0

Describe the solution you'd like
Follow similar steps followed in #35

Additional Content
to upgrade ios/magento_react_native.xcodeproj/project.pbxproj follow instructions

[sarthakpranesh]

Hey, @alexakasanjeev if no one has taken up this issue then I would like to work on it. There is just a slight problem that I won't be able to test on IOS device. If that's not a bottleneck then I would love to resolve this issue.

[sanjeevyadavIT]

Hi @sarthakpranesh sure please go ahead, would be happy to accept contribution

and I will make sure to test your branch on iOS before finally merging,

shall I assign this issue to you?