Deprecate safe_level of ERB.new in Ruby 2.6
Deprecate safe_level of ERB.new in Ruby 2.6

The interface of `ERB.new` will change from Ruby 2.6.

> Add :trim_mode and :eoutvar keyword arguments to ERB.new.
> Now non-keyword arguments other than first one are softly deprecated
> and will be removed when Ruby 2.5 becomes EOL. [Feature #14256]

https://github.com/ruby/ruby/blob/2311087/NEWS#stdlib-updates-outstanding-ones-only

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