Update changelog

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<changelog>

    <release version="4.331" versioncode="17032" >

        <change>Checking mail from the Unified Inbox is now supported</change>

        <change>Added "mark all as read" to the menu of the message list</change>

        <change>Added sort by sender</change>

        <change>Simplified status icons in the message list</change>

        <change>Fixed inability to zoom out</change>

        <change>Composing messages in right to left languages should now work better</change>

        <change>Exclude folders Trash, Spam, and Outbox from "All messages"</change>

        <change>Fixed white "flicker" when using the dark theme</change>

        <change>Updated German translation</change>

        <change>Many bug fixes</change>

    </release>

    <release version="4.330" versioncode="17031" >

        <change>Changed appearance of the unread widget</change>

        <change>Fixed crash when opening the app from notifications</change>