Fix warning Calling bridge.imageLoader is deprecated

[r0b0t3d]

Summary

Hi, I am using RN 0.61 and got this warning when using Image element on iOS.
The root cause is self.bridge.imageLoader has been deprecated

https://github.com/facebook/react-native/blob/0.61-stable/React/CoreModules/RCTImageLoader.h

Test Plan

What's required for testing (prerequisites)?

What are the steps to reproduce (after prerequisites)?

Compatibility

OS	Implemented
iOS	✅
Android	❌

Checklist

• I have tested this on a simulator
• I have tested this on a device
• I added the documentation in README.md
• I mentioned this change in CHANGELOG.md
• I updated the typed files (TS and Flow)
• I added a sample use of the API in the example project (example/App.js)

[msand]

@r0b0t3d Thanks for this! Have you tried this patch with any older versions of react-native? I think we might need to change the minimum supported version to merge this, and probably needs a major version bump.

There's actually a breaking change in the develop branch already, so this probably makes sense to release at the same time.

[msand]

Some of the new features in the develop branch are experimental/incomplete/broken still, but I think as long as I label them as such, I might be able to cut a release soon anyway. Would be great to get some examples/test case showing how they're broken to be able to fix them at this point, or create some synthetic but representative test scenarios. But haven't had any time to put into this lately.

[msand]

This is fixed in a slightly different way in the master branch / latest version. Closing. Thanks for you pr anyway!