Merge pull request #640 from Adamant-im/fix/object-group-by-not-a-function

`Object.groupBy` is not a function in older browsers

Author: bludnic

android/app/build.gradle

@@ -7,8 +7,8 @@ android {
         applicationId "im.adamant.adamantmessengerpwa"
         minSdkVersion rootProject.ext.minSdkVersion
         targetSdkVersion rootProject.ext.targetSdkVersion
-        versionCode 470
-        versionName "4.7.0"
+        versionCode 471
+        versionName "4.7.1"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         aaptOptions {
              // Files and dirs to omit from the packaged assets dir, modified to accommodate modern web apps.