Update tests from org.slf4j:slf4j-simple from 1.7.25 to 1.7.26.
diff --git a/pom.xml b/pom.xml
index 06cc58c..cb35f20 100644
--- a/pom.xml
+++ b/pom.xml
@@ -71,7 +71,7 @@
         <servicemix.xerces.version>2.11.0_1</servicemix.xerces.version>
 
         <!-- Test dependencies -->
-        <slf4j.version>1.7.25</slf4j.version>
+        <slf4j.version>1.7.26</slf4j.version>
         <junit.version>4.12</junit.version>
         <skipAPICompatCheck>false</skipAPICompatCheck>
     </properties>