Improve based on feedback

Author: andy1li

compiled_starters/ruby/app/main.rb

@@ -4,7 +4,7 @@
 if command == ".dbinfo"
   File.open(database_file_path, "rb") do |database_file|
     # You can use print statements as follows for debugging, they'll be visible when running tests.
-    warn "Logs from your program will appear here"
+    $stderr.puts "Logs from your program will appear here"
 
     # Uncomment this to pass the first stage
     # database_file.seek(16)  # Skip the first 16 bytes of the header

solutions/ruby/01-dr6/diff/app/main.rb.diff

@@ -5,7 +5,7 @@
  if command == ".dbinfo"
    File.open(database_file_path, "rb") do |database_file|
 -    # You can use print statements as follows for debugging, they'll be visible when running tests.
--    warn "Logs from your program will appear here"
+-    $stderr.puts "Logs from your program will appear here"
 -
 -    # Uncomment this to pass the first stage
 -    # database_file.seek(16)  # Skip the first 16 bytes of the header

starter_templates/ruby/code/app/main.rb

@@ -4,7 +4,7 @@
 if command == ".dbinfo"
   File.open(database_file_path, "rb") do |database_file|
     # You can use print statements as follows for debugging, they'll be visible when running tests.
-    warn "Logs from your program will appear here"
+    $stderr.puts "Logs from your program will appear here"
 
     # Uncomment this to pass the first stage
     # database_file.seek(16)  # Skip the first 16 bytes of the header