Results 1 issues of Jeevan

The function `isValidRegionCode` should accept region/country code in both lower case and upper case as per `google/libphonenumber` Reference `https://github.com/google/libphonenumber/blob/7f20d4f7c26bb5d23f2caf86ec37d60f992a3031/javascript/i18n/phonenumbers/phonenumberutil.js#L1671` If this issue is acceptable, I will create a PR

good first issue