Banch of fixes

[Serhii-Slutskyi]

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

[bbaappss]

Thanks for writing this, the package it at least working now!

[ravi-poonia]

Thx man, merged it into my fork and a bunch of other PRs as well. I'm thinking of maintaining that from now on. Will you be interested in helping out?

[zizzle6717]

@ravi-poonia Is your fork published? I would be happy to help out. I don't think the current maintainer will revisit this repo at all.

[zizzle6717]

I have published v1.0.0 and converted the source to typescript. Let me know if there is anything I can do to improve the change request process. Please submit new pull requests as the package as been more to https://github.com/rili-live/react-native-phone-input