Update pom.xml

Author: javadev

pom.xml

@@ -152,6 +152,7 @@
                   <option>-keep public class com.github.underscore.Predicate { *; }</option>
                   <option>-keep public class com.github.underscore.Template { *; }</option>
                   <option>-keep public class com.github.underscore.Tuple { *; }</option>
+                  <option>-keep public class com.github.underscore.UnaryOperator { *; }</option>
                   <option>-keepclassmembers class * { *** newArrayList(); *** newLinkedHashSet(); *** newHashSet(java.lang.Iterable); *** newLinkedHashMap(); }</option>
                   <option>-dontnote com.github.underscore.*$ClassForName</option>
               </options>