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because simplecov originally reads the source file as binary https://github.com/colszowka/simplecov/blob/v0.16.1/lib/simplecov/source_file.rb#L94.
This Encoding::UndefinedConversionError #20 is essentially caused by the mismatch of protocols between read and write.
If we always use the template encoding of views/detail.html.erb (UTF-8), it should work for many cases, but such a fix won't work for an encoding which is not compatible with UTF-8. So this patch should be the best fix for this issue.
Fix #20