README in gecoder-0.7.0 vs README in gecoder-0.7.1

@@ -31,10 +31,10 @@
 
 "gecode.so" might have another extension depending on which platform it's 
 generated on (replace the extension in the following commands with whatever 
 extension it's given).
 
-	cd ext
+  cd ext
   ruby extconf.rb
   make
   mv gecode.so ../lib/
 
 == Running the tests