Improve wording

Author: katrinleinweber

README.md

@@ -22,7 +22,7 @@ bundle install
 ```
 
 Then, in [test/test_helper.rb](test/test_helper.rb),
-comment the "Main command" `system(…)` out
+comment the "Production command" `system(…)` out
 and uncomment either of the "Testing commands".
 
 Lastly, run the following command to run the tests:

test/test_helper.rb

@@ -61,7 +61,7 @@ def run_test_runner(input_dir, output_dir)
     # exec("bin/run.sh two_fer #{input_dir} #{output_dir}")
     # system("bin/run.sh two_fer #{input_dir} #{output_dir}")
 
-    # Main command
+    # Production command
     system("bin/run.sh two_fer #{input_dir} #{output_dir}", out: "/dev/null", err: "/dev/null")
   end
 end