on jruby the clock ids are symbols, not integers

spec/initialize_spec.rb

@@ -5,7 +5,7 @@
 describe "Hitimes::Initialize" do
   it "should return a clock id" do
     val = Hitimes::Initialize.determine_clock_id
-    _(val).must_be_kind_of(Integer)
+    _(val).wont_be_nil
   end
 
   it "should return :CLOCK_REALTIME as a last option" do