no donate notice in changelog when using the app for one of the first times

src/keepass2android/ChangeLog.cs

@@ -9,6 +9,7 @@ using Android.Content.PM;
 using Android.Content.Res;
 using Android.Graphics;
 using Android.OS;
+using Android.Preferences;
 using Android.Runtime;
 using Android.Text;
 using Android.Text.Method;
@@ -147,6 +148,19 @@ namespace keepass2android
 				string versionLog2 = versionLog; 
 				bool title = true;
 			    if (isFirst)
+			    {
+
+			        bool showDonateOption = true;
+			        ISharedPreferences prefs = PreferenceManager.GetDefaultSharedPreferences(ctx);
+			        if (prefs.GetBoolean(ctx.GetString(Resource.String.NoDonationReminder_key), false))
+			            showDonateOption = false;
+
+			        long usageCount = prefs.GetLong(ctx.GetString(Resource.String.UsageCount_key), 0);
+
+			        if (usageCount <= 5)
+			            showDonateOption = false;
+
+			        if (showDonateOption)
 			        {
 			            if (versionLog2.EndsWith("\n") == false)
 			                versionLog2 += "\n";
@@ -154,10 +168,12 @@ namespace keepass2android
 			                new Java.Lang.Object[]{ctx.Resources.Configuration.Locale.Language,
 			                    ctx.PackageName
 			                });
+
 			            versionLog2 += " * <a href=\"" + donateUrl
 			                           + "\">" +
 			                           ctx.GetString(Resource.String.ChangeLog_keptDonate)
 			                           + "<a/>";
+			        }
 			        isFirst = false;
 			    }
                 foreach (string line in versionLog2.Split('\n'))