Some trailing spaces exists in some files.

[mnbi]

Following files has trailing spaces.

• lib/textrepo/file_system_repository.rb (65)
• lib/textrepo/timestmp.rb (158)
• examples/rbnotes/lib/rbnotes/commands/list.rb (39)
• test/fixtures/setup_test_repo.rb (31)
• test/textrepo_timestamp_test.rb (94)

They should be removed.

Trailing spaces can be found using searcher like rg. Here is an example to find:

> rg '[\s]+$'

[mnbi]

Fixed by the commit (b1a96941fc14c71be77f4042d7674e99ae9fbef6).