Upgrade slf4j 1.7.13

Author: slandelle

pom.xml

@@ -378,7 +378,7 @@
 		<surefire.redirectTestOutputToFile>true</surefire.redirectTestOutputToFile>
 		<source.property>1.8</source.property>
 		<target.property>1.8</target.property>
-		<slf4j.version>1.7.12</slf4j.version>
+		<slf4j.version>1.7.13</slf4j.version>
 		<logback.version>1.1.3</logback.version>
 		<log4j.version>1.2.17</log4j.version>
 		<testng.version>6.9.9</testng.version>