$ bundle exec mortar fire --output examples/basic/ basic
/Users/jussi/code/mortar/lib/mortar/fire_command.rb:75:in `block in resources_output': can't modify frozen String (RuntimeError)
from /Users/jussi/code/mortar/lib/mortar/fire_command.rb:74:in `each'
from /Users/jussi/code/mortar/lib/mortar/fire_command.rb:74:in `resources_output'
from /Users/jussi/code/mortar/lib/mortar/fire_command.rb:29:in `execute'
from /Users/jussi/.rvm/gems/ruby-2.4.2/gems/clamp-1.3.0/lib/clamp/command.rb:66:in `run'
from /Users/jussi/.rvm/gems/ruby-2.4.2/gems/clamp-1.3.0/lib/clamp/subcommand/execution.rb:18:in `execute'
from /Users/jussi/.rvm/gems/ruby-2.4.2/gems/clamp-1.3.0/lib/clamp/command.rb:66:in `run'
from /Users/jussi/.rvm/gems/ruby-2.4.2/gems/clamp-1.3.0/lib/clamp/command.rb:140:in `run'
from /Users/jussi/code/mortar/bin/mortar:13:in `<top (required)>'
from /Users/jussi/.rvm/gems/ruby-2.4.2/bin/mortar:23:in `load'
from /Users/jussi/.rvm/gems/ruby-2.4.2/bin/mortar:23:in `<main>'
from /Users/jussi/.rvm/gems/ruby-2.4.2/bin/ruby_executable_hooks:15:in `eval'
from /Users/jussi/.rvm/gems/ruby-2.4.2/bin/ruby_executable_hooks:15:in `<main>'