Improve code per Sonar recs

Author: jeffgbutler

src/main/java/org/mybatis/dynamic/sql/configuration/GlobalConfiguration.java

@@ -23,6 +23,8 @@
 public class GlobalConfiguration {
     private static boolean unrenderableWhereClauseAllowed = false;
 
+    private GlobalConfiguration() {}
+
     static {
         String propertyFile = "mybatis-dynamic-sql.properties";
         try (InputStream is = GlobalConfiguration.class.getResourceAsStream(propertyFile)) {