use readline 2.6

Author: stalep

pom.xml

@@ -58,7 +58,7 @@
       <!-- maven-compiler-plugin -->
       <maven.compiler.target>1.8</maven.compiler.target>
       <maven.compiler.source>1.8</maven.compiler.source>
-      <readline.version>2.5</readline.version>
+      <readline.version>2.6</readline.version>
     </properties>
 
     <developers>