Removed the unnecessary blank lines (#2424)

Author: Roger3581321

pom.xml

@@ -75,9 +75,7 @@
         <module>sentinel-adapter</module>
         <module>sentinel-cluster</module>
         <module>sentinel-logging</module>
-
         <module>sentinel-dashboard</module>
-
         <module>sentinel-demo</module>
         <module>sentinel-benchmark</module>
     </modules>