fix: Fixed failing to find headers when linked with Pods.

If you've linked using react-native link, you will have to rerun the
command.

If you've linked manually, find your Podfile, and make the following
changes:

```diff
- pod 'react-native-async-storage', :path => '../node_modules/@react-native-community/async-storage'
+ pod 'RNCAsyncStorage', :path => '../node_modules/@react-native-community/async-storage'
```

Author: tido64

react-native-async-storage.podspec renamed to RNCAsyncStorage.podspec

@@ -3,7 +3,7 @@ require 'json'
 package = JSON.parse(File.read(File.join(__dir__, 'package.json')))
 
 Pod::Spec.new do |s|
-  s.name         = "react-native-async-storage"
+  s.name         = "RNCAsyncStorage"
   s.version      = package['version']
   s.summary      = package['description']
   s.license      = package['license']