Merge pull request #629 from petergoldstein/feature/ruby_3_1_ci

Get tests running under Ruby 3.1 and add to CI

Author: pitbulk

.github/workflows/test.yml

@@ -9,7 +9,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest]
-        ruby-version: [2.1.9, 2.2.10, 2.3.8, 2.4.6, 2.5.8, 2.6.6, 2.7.2, 3.0.1, jruby-9.1.17.0, jruby-9.2.17.0, truffleruby]
+        ruby-version: [2.1.9, 2.2.10, 2.3.8, 2.4.6, 2.5.8, 2.6.6, 2.7.2, 3.0.1, '3.1', jruby-9.1.17.0, jruby-9.2.17.0, truffleruby]
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v2

ruby-saml.gemspec

@@ -54,7 +54,12 @@ Gem::Specification.new do |s|
   s.add_development_dependency('shoulda',  '~> 2.11')
   s.add_development_dependency('simplecov')
   s.add_development_dependency('systemu',  '~> 2')
-  s.add_development_dependency('timecop',  '<= 0.6.0')
+
+  if RUBY_VERSION < '2.1'
+    s.add_development_dependency('timecop',  '<= 0.6.0')
+  else
+    s.add_development_dependency('timecop',  '~> 0.9')
+  end
 
   if defined?(JRUBY_VERSION)
     # All recent versions of JRuby play well with pry