Bug/update readme #73

[yaroslavsudnik]

Closes #73

Proposed changes

In v2.0.0 the listener class name was changed, also been refactor OptView class. But the README was not changed. Necessary changes: setListener -> setOtpCompletionListener. Excerpt:

private OtpView otpView;
 otpView = findViewById(R.id.otp_view);
 otpView.setListener(new OnOtpCompletionListener() {
   @Override public void onOtpCompleted(String otp) {

     // do Stuff
     Log.d("onOtpCompleted=>", otp);
   }
 });

Types of changes

What types of changes does your code introduce? Put an x in the boxes that apply

• [x] Bugfix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code.

• [x] I have read the CONTRIBUTING doc
• [x] I have added necessary documentation (if appropriate)
• [ ] Any dependent changes have been merged and published in downstream modules

Further comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...

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