update README.md and example

[rashidotm]

this pr is to update code samples in readme and in exmaple

[rashidotm]

this fixes #241

[cedvdb]

Thanks for your contribution. I'm confused why the example compiled and was uploaded to github page if it was erroneous like that

[cedvdb]

The build is now failing. It seems like you are using an old version in example or something. If you check the validation code for example, they all take a context but you removed the context:

https://github.com/cedvdb/phone_form_field/blob/main/lib/src/validation/phone_validator.dart#L55

[rashidotm]

This is embarrassing!

You are right. I was using an old version and haven't noticed till you pointed it out.

[rashidotm]

closing this as the version used was not latest.

[cedvdb]

@rashidotm did you clone the repository a long time ago ? I'm wondering if something needs changing in the lock file or something or if it's just due to not pulling

[rashidotm]

it is not you, it is me.

I did clone the repo this week. but when I tried the example my mistake was that I copied it into a fresh flutter project. my flutter version was old and hence pub get auto resolved to an older version of this package.