Update Lumolight F-Droid link (#506)

Author: offa

README.md

@@ -380,7 +380,7 @@ A list of **Free** and **Open Source Software** ***(FOSS)*** for **Android** –
 
 * [**FlashDim**](https://github.com/cyb3rko/flashdim) <sup>**[[F-Droid](https://f-droid.org/app/com.cyb3rko.flashdim)]**</sup>
 * [**Flashy**](https://github.com/Crazy-Marvin/Flashy) <sup>**[[F-Droid](https://f-droid.org/app/rocks.poopjournal.flashy)]**</sup>
-* [**Lumolight**](https://github.com/BitMavrick/Lumolight) <sup>**[[IzzyOnDroid](https://apt.izzysoft.de/fdroid/index/apk/com.bitmavrick.lumolight)]**</sup>
+* [**Lumolight**](https://github.com/BitMavrick/Lumolight) <sup>**[[F-Droid](https://f-droid.org/app/com.bitmavrick.lumolight)]**</sup>
 
 ### • Graphics