Fixed dependency version

Author: rijnb

.idea/.gitignore

@@ -84,7 +84,7 @@
         <nexus-staging-maven-plugin.version>1.6.8</nexus-staging-maven-plugin.version>
 
         <!-- libraries. -->
-        <gson.version>2.8.5</gson.version>
+        <gson.version>2.8.6</gson.version>
         <jsr305.version>3.0.2</jsr305.version>
         <junit.version>4.12</junit.version>
         <log4j.version>1.2.17</log4j.version>