Lower requirement on QtQuick.Layouts version

resources/qml/TimelineView.qml

@@ -1,6 +1,6 @@
 import QtQuick 2.6
 import QtQuick.Controls 2.1
-import QtQuick.Layouts 1.5
+import QtQuick.Layouts 1.2
 import QtGraphicalEffects 1.0
 import QtQuick.Window 2.2
 

resources/qml/delegates/FileMessage.qml

@@ -1,5 +1,5 @@
 import QtQuick 2.6
-import QtQuick.Layouts 1.6
+import QtQuick.Layouts 1.2
 
 Rectangle {
 	radius: 10

resources/qml/delegates/PlayableMediaMessage.qml

@@ -1,5 +1,5 @@
 import QtQuick 2.6
-import QtQuick.Layouts 1.6
+import QtQuick.Layouts 1.2
 import QtQuick.Controls 2.1
 import QtMultimedia 5.6