Remove unmaintained Quacker

Author: offa

README.md

@@ -230,7 +230,6 @@ A list of **Free** and **Open Source Software** ***(FOSS)*** for **Android** –
 * [**OctoDroid**](https://github.com/slapperwan/gh4a) <sup>**[[F-Droid](https://f-droid.org/app/com.gh4a)]**</sup>
 * [**Odysee**](https://github.com/OdyseeTeam/odysee-android-floss) <sup>**[[F-Droid](https://f-droid.org/app/com.odysee.floss)]**</sup>
 * [**PixelDroid**](https://gitlab.shinice.net/pixeldroid/PixelDroid) <sup>**[[F-Droid](https://f-droid.org/app/org.pixeldroid.app)]**</sup>
-* [**Quacker**](https://github.com/TheHCJ/Quacker) <sup>**[[F-Droid](https://f-droid.org/app/com.thehcj.quacker)]**</sup>
 * [**RedReader**](https://github.com/QuantumBadger/RedReader) <sup>**[[F-Droid](https://f-droid.org/app/org.quantumbadger.redreader)]**</sup>
 * [**Slide**](https://github.com/ccrama/Slide) <sup>**[[F-Droid](https://f-droid.org/app/me.ccrama.redditslide)]**</sup>
 * [**Squawker**](https://github.com/j-fbriere/squawker) <sup>**[[F-Droid](https://f-droid.org/app/org.ca.squawker)]**</sup>