run_tests - use byebug instead of debugger

diff --git a/bin/run_tests b/bin/run_tests
index 8450a9b..241a3fa 100755 (executable)
--- a/bin/run_tests
+++ b/bin/run_tests
@@ -507,7 +507,7 @@ end
 
 if ARGV.include?('--debug') || ARGV.include?('-d')
   DEBUG=true
-  require 'debugger'
+  require 'byebug'
 else
   DEBUG=false
 end