Fix objective c import in api.md

[thorgas]

hi @maxkomarychev,
thank you very much for this library! Not sure if something in my setup is wrong, but in order to use the env variables in Objective-c I had to change the import from your docs (https://github.com/maxkomarychev/react-native-ultimate-config/blob/master/docs/api.md#objective-c) to #import <react_native_ultimate_config/ConfigValues.h>

[maxkomarychev]

Hi, I have not experienced this. Could you please share more information about your setup? (version of Xcode, iOS deployment target, whether swift is used or no etc).

Thanks!

[thorgas]

Hi,
my Xcode version is Version 14.3.1 (14E300c), IPHONEOS_DEPLOYMENT_TARGET = 14.0, we are using a bridging header and we have a module integrated via spm via Frameworks, Libraries, and embedded Content in Xcode under TARGETS -> General. RN version is 0.71.0. Above mentioned import happens in AppDelegate.mm

[dkulakov]

Hi @thorgas , thanks for your PR, that's really helpful for me!

@maxkomarychev this PR is fix for the issue #144

[alexkev]

Thanks @thorgas for your PR!