Update dependency com.github.kittinunf.fuel:fuel to v2.3.1

Author: renovate-bot

games-server/build.gradle

@@ -62,7 +62,7 @@ dependencies {
     compile 'org.slf4j:slf4j-log4j12:1.7.30'
     compile "com.github.lewik.klog:klog-jvm:$kotlin_version"
     compile "io.javalin:javalin:2.8.0"
-    compile "com.github.kittinunf.fuel:fuel:2.3.0"
+    compile "com.github.kittinunf.fuel:fuel:2.3.1"
     compile group: 'com.amazonaws', name: 'aws-java-sdk-dynamodb', version: '1.11.879'
     compile group: 'org.postgresql', name: 'postgresql', version: '42.2.14'
     compile 'com.zaxxer:HikariCP:3.4.5'