MANIFEST in ptools-1.0.0 vs MANIFEST in ptools-1.1.0

@@ -9,9 +9,10 @@
 test/ts_all.rb
 test/tc_constants.rb
 test/tc_head.rb
 test/tc_middle.rb
 test/tc_nlconvert.rb
+test/tc_null.rb
 test/tc_tail.rb
 test/tc_touch.rb
 test/tc_wc.rb
 test/tc_which.rb
 test/tc_whereis.rb