added sl4j-simple to fix #64

Author: Manish Bhatia

pom.xml

@@ -72,6 +72,12 @@
             <version>1.7.32</version>
         </dependency>
 
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-simple</artifactId>
+            <version>1.7.32</version>
+        </dependency>
+
         <!-- https://mvnrepository.com/artifact/commons-codec/commons-codec -->
         <dependency>
             <groupId>commons-codec</groupId>