Merge pull request #562 from tknzk/test-ruby3

Test Against Ruby 3.0.0

Author: pitbulk

.travis.yml

@@ -10,6 +10,7 @@ rvm:
   - 2.5.8
   - 2.6.6
   - 2.7.2
+  - 3.0.0
   - ree
   - jruby-1.7.27
   - jruby-9.1.17.0
@@ -45,5 +46,7 @@ matrix:
       gemfile: gemfiles/nokogiri-1.5.gemfile
     - rvm: 2.7.2
       gemfile: gemfiles/nokogiri-1.5.gemfile
+    - rvm: 3.0.0
+      gemfile: gemfiles/nokogiri-1.5.gemfile
 env:
   - JRUBY_OPTS="--debug"

ruby-saml.gemspec

@@ -44,6 +44,7 @@ Gem::Specification.new do |s|
   else
     s.add_runtime_dependency('nokogiri', '>= 1.10.5')
   end
+  s.add_runtime_dependency('rexml')
 
   s.add_development_dependency('coveralls')
   s.add_development_dependency('minitest', '~> 5.5')