Update README.md

Author: PolarbearDK

README.md

@@ -4,10 +4,10 @@ Miracle.Macros
 Expand macros in strings.
 
 Sample usage:
-````
+```csharp
 var macroString = "Hello ${Location}";
 Console.WriteLine(macroString.ExpandMacros(new { Location = "World"});
-````
+```
 
 Macros has the form: 
 ````
@@ -25,4 +25,4 @@ Composite formatting can be applied using:
 ````
 ${Property:format}
 ${Property.SubProperty:format}
-````
+````