exe/merge in pivotoolz-0.1.2 vs exe/merge in pivotoolz-0.1.3

@@ -2,9 +2,10 @@
 
 target_branch = ARGV[0]&.strip
 
 if target_branch.nil? || target_branch.empty?
   puts "You must provide a target branch name!"
+  puts "Usage: merge TARGET_BRANCH"
   exit 1
 end
 
 current_branch  = `git rev-parse --abbrev-ref HEAD`.strip
 branch_to_merge = current_branch