use old lambda syntax

Leo Silva Souza · Leo Silva Souza · commit b148ecbfc9f3 · 2018-12-07T18:44:33.000-02:00
diff --git a/2018/07_2/ruby/leovano.rb b/2018/07_2/ruby/leovano.rb
@@ -23,7 +23,7 @@
   steps_current.sort!
   steps_current.uniq!
 
-  is_ready = ->(task) { (dependencies[task] - steps_done).empty? }
+  is_ready = lambda { |task| (dependencies[task] - steps_done).empty? }
   workers += steps_current
              .select(&is_ready)
              .take(MAXWORKERS - workers.size)
