fishwife.patch

diff --git a/src/main/java/fishwife/IOUtil.java b/src/main/java/fishwife/IOUtil.java
index ee874b5..dcc0760 100644
--- a/src/main/java/fishwife/IOUtil.java
+++ b/src/main/java/fishwife/IOUtil.java
@@ -32,7 +32,7 @@ import org.jruby.RubyString;
 import org.jruby.anno.JRubyClass;
 import org.jruby.anno.JRubyMethod;
 import org.jruby.javasupport.util.RuntimeHelpers;
-import org.jruby.runtime.Arity;
+import org.jruby.runtime.Signature;
 import org.jruby.runtime.Block;
 import org.jruby.runtime.BlockCallback;
 import org.jruby.runtime.CallBlock;
@@ -115,7 +115,7 @@ public class IOUtil
         RuntimeHelpers.invoke( tc, body, "each",
            CallBlock.newCallClosure( klazz,
                                      tc.getRuntime().getEnumerable(),
-                                     Arity.ONE_ARGUMENT,
+                                     Signature.ONE_ARGUMENT,
                                      new AppendBlockCallback( tc.getRuntime(),
                                                               ostream ),
                                                               tc ) );