Roll back to Java 7 compatible version.

anjackson · anjackson · commit 3c910fbd1a04 · 2017-09-11T15:45:00.000+01:00
diff --git a/pom.xml b/pom.xml
@@ -163,7 +163,7 @@
     <dependency>
       <groupId>it.unimi.dsi</groupId>
       <artifactId>dsiutils</artifactId>
-      <version>2.4.0</version>
+      <version>2.3.5</version>
       <exclusions>
         <exclusion>
           <groupId>ch.qos.logback</groupId>
