version bump to 2.6.1 + changelog

CHANGELOG.md

 # Changelog
 
+### Version 2.6.1
+* fixes for Jingle IBB file transfer
+* fixes for repeated corrections filling up the database
+* switched to Last Message Correction v1.1
+
 ### Version 2.6.0
 * Introduce expert setting to perform channel discovery on local server instead of [search.jabber.network](https://search.jabber.network)
 * Enable delivery check marks by default and remove setting

build.gradle

@@ -84,8 +84,8 @@ android {
     defaultConfig {
         minSdkVersion 16
         targetSdkVersion 28
-        versionCode 349
-        versionName "2.6.0"
+        versionCode 351
+        versionName "2.6.1"
         archivesBaseName += "-$versionName"
         applicationId "eu.siacs.conversations"
         resValue "string", "applicationId", applicationId