Suppress "literal string will be frozen in the future" warning #353
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Before change: ```console $ rake 2>&1 | grep 'iruby.*frozen' /Users/zzz/src/github.com/SciRuby/iruby/lib/iruby/formatter.rb:128: warning: literal string will be frozen in the future /Users/zzz/src/github.com/SciRuby/iruby/lib/iruby/formatter.rb:96: warning: literal string will be frozen in the future ``` After change: ```console $ rake 2>&1 | grep 'iruby.*frozen' ```
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Before change:
After change:
$ rake 2>&1 | grep 'iruby.*frozen'