Get rid of deprecation warning on ruby 2.7.1

[denny]

Hi, I have no idea if I'm doing something useful here, or masking a problem that should be fixed elsewhere, or doing something even more stupid than that (Perl developer crosstraining to Ruby, sorry!) - but it does seem to make a deprecation warning go away for me so I thought I'd create a PR and let you decide.

[denny]

denny@rocinante:~$ mkdir minimal_test_case
denny@rocinante:~$ mkdir minimal_test_case/app
denny@rocinante:~$ cd minimal_test_case/
denny@rocinante:~/minimal_test_case$ ruby -v
 ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [x86_64-linux]
denny@rocinante:~/minimal_test_case$ gem install i18n-tasks
 # Install default configuration:
 cp $(bundle exec i18n-tasks gem-path)/templates/config/i18n-tasks.yml config/
 # Add an RSpec for missing and unused keys:
 cp $(bundle exec i18n-tasks gem-path)/templates/rspec/i18n_spec.rb spec/
 Successfully installed i18n-tasks-0.9.31
 Parsing documentation for i18n-tasks-0.9.31
 Done installing documentation for i18n-tasks after 0 seconds
 1 gem installed
denny@rocinante:~/minimal_test_case$ head -47 /home/denny/.rvm/gems/ruby-2.7.1/gems/i18n-tasks-0.9.31/lib/i18n/tasks/command/dsl.rb | tail -4
        # late-bound I18n.t for module bodies
        def t(*args)
          proc { I18n.t(*args) }
        end
denny@rocinante:~/minimal_test_case$ i18n-tasks missing
 /home/denny/.rvm/gems/ruby-2.7.1/gems/i18n-tasks-0.9.31/lib/i18n/tasks/command/dsl.rb:46: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
 /home/denny/.rvm/gems/ruby-2.7.1/gems/i18n-1.8.2/lib/i18n.rb:195: warning: The called method `t' is defined here
 ✓ Perfect! No translations are missing.
denny@rocinante:~/minimal_test_case$ i18n-tasks unused
 /home/denny/.rvm/gems/ruby-2.7.1/gems/i18n-tasks-0.9.31/lib/i18n/tasks/command/dsl.rb:46: warning: Using the last argument as keyword parameters is deprecated; maybe ** should be added to the call
 /home/denny/.rvm/gems/ruby-2.7.1/gems/i18n-1.8.2/lib/i18n.rb:195: warning: The called method `t' is defined here
 ✓ Well done! Every translation is in use.
denny@rocinante:~/minimal_test_case$ cp -f ../patched-dsl.rb /home/denny/.rvm/gems/ruby-2.7.1/gems/i18n-tasks-0.9.31/lib/i18n/tasks/command/dsl.rb
denny@rocinante:~/minimal_test_case$ head -47 /home/denny/.rvm/gems/ruby-2.7.1/gems/i18n-tasks-0.9.31/lib/i18n/tasks/command/dsl.rb | tail -4
        # late-bound I18n.t for module bodies
        def t(*args, **opts)
          proc { I18n.t(*args, **opts) }
        end
denny@rocinante:~/minimal_test_case$ i18n-tasks missing
 ✓ Perfect! No translations are missing.
denny@rocinante:~/minimal_test_case$ i18n-tasks unused
 ✓ Perfect! Every translation is in use.
denny@rocinante:~/minimal_test_case$

[glebm]

Thanks!