[feat] add customItemValueDelimiter #5
                
     Merged
            
            
          
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Original pr: https://github.com/hossein-zare/react-native-dropdown-picker/pull/670/files
Original note:
Hey @hossein-zare, saw a potential small issue with the custom item value .replace() modifier for spaces. This update will allow users to customize the delimiter for the value saved when selecting a custom item and make sure that the delimiter is implemented in all space instances.
The value for the customItemValueDelimiter defaults to what was already in place (-).
.replace() was replaced (no pun intended) with .replaceAll().
Helps resolve issue hossein-zare#604.
Thank you for your feedback!