Update Nokogiri to 1.11.0 when ready

[skoji]

• Add support for Ruby-2.7 on Windows sparklemotion/nokogiri#1961
• When Nokogiri 1.11.0 is released, we should remove this

[chloerei]

Is it possible to replace nokogiri with rexml? Install nokogiri in ubuntu need almost 200mb for compilation tools, it's too big for a command line tool that I want to distribute via docker...

[skoji]

@chloerei I think it's possible but not so easy. I'm thinking of introducing XML abstraction layer to switch XML library, like epub-parser.

[chloerei]

@skoji If Nokogiri is not superior to REXML under the requirements of this gem(Maybe performance?), I think REXML is enough. Abstraction layer required extra work and maybe not important for user.

Also I found I can install ruby-nokogiri package from ubuntu repo, that need 34.8 MB space, less then compile at install time. I feel better now.

[skoji]

I think performance is important for some use cases. (e.g. asciidoctor-epub3)

[chloerei]

I also depend on Nokogiri to parse HTML, so don't need to worry about it.

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Revoke this comment.

[flavorjones]

Nokogiri release candidate v1.11.0.rc1 has been released with precompiled native libraries for Windows and Ruby 2.7. Please give it a whirl and let me know if you have any problems.

[slonopotamus]

I can't believe there's still no stable Nokogiri release for Ruby 2.7 on Windows.

[flavorjones]

@slonopotamus please see sparklemotion/nokogiri#2029 (comment)

[flavorjones]

Nokogiri v1.10.10 has been released with precompiled support for Ruby 2.7 on Windows.

[slonopotamus]

I've created #120 that enables CI on Windows + Ruby 2.7 (and it passes)