renaming distribution tag

Author: rajdeepv

bin/parallel_calabash

@@ -25,7 +25,7 @@ def parse_arguments(arguments)
       options[:apk_path] = apk_path
     end
 
-    opts.on("-d", "--distribution-tag distribution_tag", "divide features into groups as per occurrence of given tag") do |distribution_tag|
+      opts.on("-d", "--distribution-tag tag", "divide features into groups as per occurrence of given tag") do |distribution_tag|
       options[:distribution_tag] = distribution_tag
     end