Ref: add new static analyser rule: design.xml/ClassWithOnlyPrivateConstructorsShouldBeFinal

src/main/java/com/sheepit/client/Log.java

@@ -32,7 +32,7 @@ import java.util.HashMap;
 import java.util.Map;
 import java.util.Optional;
 
-public class Log {
+public final class Log {
 	private final String LEVEL_DEBUG = "debug";
 	private final String LEVEL_INFO = "info";
 	private final String LEVEL_ERROR = "error";