fix term child opt in code

thanks @wuputah

Author: hone

lib/resque/tasks.rb

@@ -15,7 +15,7 @@
       worker.verbose = ENV['LOGGING'] || ENV['VERBOSE']
       worker.very_verbose = ENV['VVERBOSE']
       worker.term_timeout = ENV['RESQUE_TERM_TIMEOUT'] || 4.0
-      worker.term_child = ENV['TERM_CHILD'].to_i || 1
+      worker.term_child = ENV['TERM_CHILD']
     rescue Resque::NoQueueError
       abort "set QUEUE env var, e.g. $ QUEUE=critical,high rake resque:work"
     end