I wanted to use this library, but when I installed it, I had a lot of problems

• Picker was deprecated from react-native core repository
  This pull was fixed picker problem, and I only added to readme that picker should be installed from @react-native-community/picker

• Some components have an issues with Maximum update depth exceeded...

to fix this issue update lib/countryPicker.js:

componentDidUpdate() {
    if(this.props.selectedCountry !== this.state.selectedCountry) {
      this.setState({
        selectedCountry: this.props.selectedCountry,
      });
    }
  }

• Also the core ability to use of library is to use countries and get dialCode on input wasn't worked

So I reworked it, added ability to use Country code or not via prop useCountryCode