README fix

Author: Scony

README.md

@@ -71,7 +71,7 @@ To run a formatter you need to perform installation first. Once done, given a `t
 ```
 class X:
 	var x=[1,2,{'a':1}]
-    var y=[1,2,3,]     # trailing comma
+	var y=[1,2,3,]     # trailing comma
 	func foo(a:int,b,c=[1,2,3]):
 		if a in c and \
 		   b > 100: