Update kotlin to v1.3.61
diff --git a/pom.xml b/pom.xml
index 5fcff7c..a504a9b 100644
--- a/pom.xml
+++ b/pom.xml
@@ -49,7 +49,7 @@
         <log4j2.version>2.12.1</log4j2.version>
         <slf4j.version>1.7.29</slf4j.version>
         <groovy.version>2.5.8</groovy.version>
-        <kotlin.version>1.3.60</kotlin.version>
+        <kotlin.version>1.3.61</kotlin.version>
         <snakeyaml.version>1.25</snakeyaml.version>
         <spock.version>1.3-groovy-2.5</spock.version>
         <jackson.version>2.10.0</jackson.version>