bin/flex-station in flex-station-data-1.0.1 vs bin/flex-station in flex-station-data-1.0.2

@@ -1,6 +1,7 @@
 #!/usr/bin/env ruby
+# frozen_string_literal: true
 
 require "pathname"
 require "flex_station_data/concerns/callable"
 
 class App
@@ -26,10 +27,10 @@
     when "linear-regression"
       exec(linear_regression_path.to_path, *args)
     when "help", "--help"
       puts "USAGE: flex-station <command>"
     else
-      $stderr.puts "Unrecognised command: #{command}"
+      warn "Unrecognised command: #{command}"
       exit(1)
     end
   end
 end