Fix ios compile error on RN 0.48+

[paullinator]

This PR fixes a compile error in iOS when using RN v0.48 or higher. Issue referenced here:

zoontek/react-native-permissions#137

[mvayngrib]

@paullinator afaik, RN >= 0.40 supports import <React/RCTBridgeModule.h>. This PR is still useful as it would allow react-native-randombytes to support RN < 0.40, but the <React/RCTBridge.h> import would also need to be adjusted, as well as the imports in RNRandomBytes.h

[paullinator]

From what I can tell, RN 48+ does not support import <React/RCTBridgeModule.h>. That's the reason for this change. It needed to move to `import "RCTBridgeModule.h"'

I'm not aware of RCTBridge.h having to change. We are using this change in our repo for both RN 48+ and <48 just fine.

[mvayngrib]

hm, works for me on 0.48.4 without any modifications: https://github.com/mvayngrib/rn-randombytes-test

[abdurrahmanekr]

@paullinator It does not work without deleting the following:

react-native-randombytes/RNRandomBytes.m

Lines 10 to 11 in cc3dc88

	#import <React/RCTBridgeModule.h>
	#import <React/RCTBridge.h>

react-native version: 0.52.1

[paullinator]

We are only on RN 51. It seems to work fine there.

[mvayngrib]

closing, please reopen if it's still an issue. See recent changes in #28