[ruby/rdoc] Drop old rubies
RbConfig::CONFIG['ridir'] has been set since 1.9.2
RbConfig::CONFIG['ridir']
ENV["HOME"] has been defaulted to USERPROFILE since 1.9.0, and backported to 1.8.5 or later.
ENV["HOME"]
USERPROFILE
https://github.com/ruby/rdoc/commit/a3a614e676
Added by nobu (Nobuyoshi Nakada) over 5 years ago
[ruby/rdoc] Drop old rubies
RbConfig::CONFIG['ridir']has been set since 1.9.2ENV["HOME"]has been defaulted toUSERPROFILEsince 1.9.0,and backported to 1.8.5 or later.
https://github.com/ruby/rdoc/commit/a3a614e676