Use correct character for child selector.

src/Markup/Perspex.Markup.Xaml/Parsers/SelectorGrammar.cs

@@ -89,7 +89,7 @@ namespace Perspex.Markup.Xaml.Parsers
             from close in Parse.Char(']').Once()
             select new PropertySyntax { Property = identifier, Value = value };
 
-        public static readonly Parser<ChildSyntax> Child = Parse.Char('<').Token().Return(new ChildSyntax());
+        public static readonly Parser<ChildSyntax> Child = Parse.Char('>').Token().Return(new ChildSyntax());
 
         public static readonly Parser<DescendentSyntax> Descendent =
             from child in Parse.WhiteSpace.Many()

tests/Perspex.Markup.Xaml.UnitTests/Parsers/SelectorGrammarTests.cs

@@ -91,7 +91,7 @@ namespace Perspex.Xaml.Base.UnitTest.Parsers
         [Fact]
         public void OfType_Child_Class()
         {
-            var result = SelectorGrammar.Selector.Parse("Button < .foo").ToList();
+            var result = SelectorGrammar.Selector.Parse("Button > .foo").ToList();
 
             Assert.Equal(
                 new SelectorGrammar.ISyntax[]
@@ -106,7 +106,7 @@ namespace Perspex.Xaml.Base.UnitTest.Parsers
         [Fact]
         public void OfType_Child_Class_No_Spaces()
         {
-            var result = SelectorGrammar.Selector.Parse("Button<.foo").ToList();
+            var result = SelectorGrammar.Selector.Parse("Button>.foo").ToList();
 
             Assert.Equal(
                 new SelectorGrammar.ISyntax[]