housekeeping: Make Splat 6.* the default. (#1900)

* housekeeping: Make Splat 6.* the default.

Author: glennawatson

src/ReactiveUI.Tests/PocoObservableForPropertyTests.cs

@@ -66,6 +66,11 @@ public void Write(string message, LogLevel logLevel)
             {
                 LastMessages.Add(message);
             }
+
+            public void Write([Localizable(false)] string message, [Localizable(false)] Type type, LogLevel logLevel)
+            {
+                LastMessages.Add(message);
+            }
         }
     }
 }

src/ReactiveUI.Tests/ReactiveCollectionTest.cs

@@ -1704,7 +1704,7 @@ public void DerivedCollectionsShouldWarnWhenSourceIsNotINotifyCollectionChanged(
 
                     var m = logger.Messages.Last();
                     var message = m.Item1;
-                    var level = m.Item2;
+                    var level = m.Item3;
 
                     Assert.Contains("INotifyCollectionChanged", message);
                     Assert.Equal(LogLevel.Warn, level);

src/ReactiveUI.Tests/TestLogger.cs

@@ -4,6 +4,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.ComponentModel;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
@@ -15,17 +16,22 @@ public class TestLogger : ILogger
     {
         public TestLogger()
         {
-            Messages = new List<Tuple<string, LogLevel>>();
+            Messages = new List<Tuple<string, Type, LogLevel>>();
             Level = LogLevel.Debug;
         }
 
-        public List<Tuple<string, LogLevel>> Messages { get; }
+        public List<Tuple<string, Type, LogLevel>> Messages { get; }
 
         public LogLevel Level { get; set; }
 
         public void Write(string message, LogLevel logLevel)
         {
-            Messages.Add(Tuple.Create(message, logLevel));
+            Messages.Add(Tuple.Create(message, typeof(TestLogger), logLevel));
+        }
+
+        public void Write([Localizable(false)] string message, [Localizable(false)] Type type, LogLevel logLevel)
+        {
+            Messages.Add(Tuple.Create(message, type, logLevel));
         }
     }
 }

src/ReactiveUI/ReactiveUI.csproj

@@ -12,7 +12,7 @@
     <None Include="Platforms\**\*.cs" />
     <PackageReference Include="System.Reactive" Version="4.0.0" />
     <PackageReference Include="System.Reactive.Compatibility" Version="4.0.0" />
-    <PackageReference Include="Splat" Version="5.*" />
+    <PackageReference Include="Splat" Version="6.*" />
     <PackageReference Include="DynamicData" Version="6.7.*" />
   </ItemGroup>