Updated the entry for Firefly III (#923)

* Updated the entry for Firefly III

There's a new and easy to use demo site.

* Update readme

Moved repository to a new organization.

* Update README.md

Grammar fixes.

README.md

@@ -773,7 +773,7 @@ See also https://github.com/n1trux/awesome-sysadmin#it-asset-management
   * [Dot Ledger](https://www.dotledger.com/) - A web-based personal finance management tool. ([Demo](https://demo.dotledger.com/), [Source Code](https://github.com/dotledger/dotledger)) `Apache` `Ruby`
   * [Economizzer](http://www.economizzer.org/) - Economizzer is a simple and open source personal finance manager system, available in English, Brazilian, Portuguese and Russian. ([Source Code](https://github.com/gugoan/economizzer)) `MIT` `PHP`
   * [ExMoney](https://github.com/gaynetdinov/ex_money) - A [work-in-progress] self-hosted personal finance app. `ISC` `Elixir`
-  * [Firefly III](https://firefly-iii.github.io/) - Firefly III is a financial manager. It helps you keeping track of your money and make budget forecasts. It supports credit cards, shared household accounts and savings accounts. Very modern, it's powered by Laravel and requires PHP7. ([Demo](https://geld.nder.be/login), [Source Code](https://github.com/JC5/firefly-iii)) `CCBYSAv4` `PHP`
+  * [Firefly III](https://firefly-iii.github.io/) - Firefly III is a modern financial manager. It helps you to keep track of your money and make budget forecasts. It supports credit cards, shared household accounts, and savings accounts. It's powered by Laravel and requires PHP7. ([Demo](https://firefly-iii.nder.be/), [Source Code](https://github.com/firefly-iii/firefly-iii)) `CCBYSAv4` `PHP`
   * [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/)) `GPLv3` `PHP`
   * [GRR](http://grr.devome.com/?lang=en) - Assets management and booking for small/medium companies. ([Source Code](https://github.com/JeromeDevome/GRR)) `GPLv2` `PHP`
   * [Hospital Run](http://hospitalrun.io/) - Hospital Run is offline enabled hospital management software. ([Source Code](https://github.com/HospitalRun/hospitalrun-server), [Demo](http://hospitalrun.io/demo/)) `GPLv3` `Nodejs`