By Elizabeth Howcroft PARIS (Reuters) -British finance app Revolut has been granted a licence by Cyprus that will enable it to continue to target crypto-related services to grow its business, the company said on Wednesday, revealing that one fifth of its customers trade cryptocurrency. Crypto has been one of the driving forces in the rapid growth of Revolut, which last month started a secondary share sale at a $75 billion valuation. At least 14 million of Revolut's more than 65 million customers - 22% - ...