Updated readme for Firefly III

Minimum version of PHP is now 7.3 and the license has changed.

README.md

@@ -1004,7 +1004,7 @@ See also https://github.com/n1trux/awesome-sysadmin#it-asset-management
 - [Dot Ledger](https://www.dotledger.com/) - Web-based personal finance management tool. ([Demo](https://demo.dotledger.com/), [Source Code](https://github.com/dotledger/dotledger)) `Apache-2.0` `Ruby`
 - [Economizzer](http://www.economizzer.org/) - An easy and secure system for you to manage your personal money and achieve your goals, and can be accessed by computer, tablet or smartphone. ([Demo](https://github.com/gugoan/economizzer#live-demo), [Source Code](https://github.com/gugoan/economizzer)) `MIT` `PHP`
 - [ExMoney](https://github.com/gaynetdinov/ex_money) - Self-hosted personal finance app. `ISC` `Elixir`
-- [Firefly III](https://firefly-iii.org/) - Firefly III is a modern financial manager. It helps you to keep track of your money and make budget forecasts. It supports credit cards, has an advanced rule engine and can import data from many banks. It's powered by Laravel and requires PHP7.2. ([Demo](https://demo.firefly-iii.org/), [Source Code](https://github.com/firefly-iii/firefly-iii)) `GPL-3.0` `PHP`
+- [Firefly III](https://firefly-iii.org/) - Firefly III is a modern financial manager. It helps you to keep track of your money and make budget forecasts. It supports credit cards, has an advanced rule engine and can import data from many banks. It's powered by Laravel and requires PHP7.3. ([Demo](https://demo.firefly-iii.org/), [Source Code](https://github.com/firefly-iii/firefly-iii)) `AGPL-3.0` `PHP`
 - [Fava](https://beancount.github.io/fava/) - Fava is the web frontend of Beancount, a text based double-entry accounting system. ([Demo](https://fava.pythonanywhere.com/example-with-budgets/income_statement/), [Source Code](https://github.com/beancount/fava)) `MIT` `Python`
 - [Galette](http://galette.eu/dc/) - Galette is a membership management web application towards non profit organizations. ([Source Code](http://git.tuxfamily.org/galette/galette.git/)) `GPL-3.0` `PHP`
 - [GRR](http://grr.devome.com/?lang=en) - Assets management and booking for small/medium companies. ([Source Code](https://github.com/JeromeDevome/GRR)) `GPL-2.0` `PHP`