Please update version number of nokogiri as it is impossible to build

[obiwankennedy]

Hi,
Gimli is great but god it is painful to install.
Due to this bug: sparklemotion/nokogiri#2105 it is impossible to compile nokogiri so the install of gimli fails.

My system is ubuntu 22.04 LTS.

diff --git a/gimli.gemspec b/gimli.gemspec
index 5d9337c..8857ff3 100644
--- a/gimli.gemspec
+++ b/gimli.gemspec
@@ -22,7 +22,7 @@ Gem::Specification.new do |s|
   s.add_dependency 'RedCloth', '~> 4.2.7'
 
   s.add_dependency 'coderay', '~> 1.1'
-  s.add_dependency 'nokogiri', '~> 1.8.0'
+  s.add_dependency 'nokogiri', '~> 1.12.0'
 
   s.add_dependency 'wkhtmltopdf-binary', '~> 0.12.3'
   s.add_dependency 'optiflag', '~> 0.7'

Also,
your instruction to compile gimli from source doesn't say how to let gimli be installed into /usr/bin ?