Use platform line ending

Author: iamcarbon

src/D.Tests/Parser/AssignmentTests.cs

@@ -64,7 +64,7 @@ public void Read2()
             """
             image = 10
             b = 2
-            """);
+            """.ReplaceLineEndings(Environment.NewLine));
 
         var one = (BinaryExpressionSyntax)parser.Next();
         var two = (BinaryExpressionSyntax)parser.Next();