Update checkstyle-rules.xml

style/checkstyle-rules.xml

@@ -2,7 +2,7 @@
 <!DOCTYPE module PUBLIC
           "-//Checkstyle//DTD Checkstyle Configuration 1.3//EN"
           "https://checkstyle.org/dtds/configuration_1_3.dtd">
-
+ 
 <!--
     Checkstyle configuration that checks the Google coding conventions from Google Java Style
     that can be found at https://google.github.io/styleguide/javaguide.html