Add changelog of v2.1.0

Author: CodeDoctorDE

CHANGELOG.md

@@ -2,6 +2,12 @@
 
 <!--ENTER CHANGELOG HERE-->
 
+## 2.1.0 (2024-05-10)
+
+Nothing changed from the nightly build to the stable release.
+
+See all changes since the last stable here: https://linwood.dev/butterfly/2.1
+
 ## 2.1.0-rc.3 (2024-05-07)
 
 * Add button to check for updates instead of automatically checking on opening the settings ([#691](https://github.com/LinwoodDev/Butterfly/issues/691))

app/linux/debian/usr/share/metainfo/dev.linwood.butterfly.appdata.xml

@@ -39,6 +39,7 @@
 	<launchable type="desktop-id">dev.linwood.butterfly.desktop</launchable>
 	<releases>
 		<release version="2.0.3" date="2024-02-19" />
+		<release version="2.1.0" date="2024-05-10" />
 		<release version="2.0.2" date="2024-01-29" />
 		<release version="2.0.1" date="2024-01-15" />
 		<release version="2.0.0" date="2023-12-24" />