Ruby 3.0.0 (#5309)

Author: rmzelle

.github/workflows/merge.yaml

@@ -58,7 +58,7 @@ jobs:
       if: github.event_name == 'workflow_dispatch' || (github.event_name == 'push' && (steps.update.outputs.updated == 'true' || steps.update.outputs.deleted == 'true'))
       uses: ruby/setup-ruby@v1
       with:
-        ruby-version: 2.7.1
+        ruby-version: 3.0.0
     - name: but use cache to speed that up
       if: github.event_name == 'workflow_dispatch' || (github.event_name == 'push' && (steps.update.outputs.updated == 'true' || steps.update.outputs.deleted == 'true'))
       uses: actions/cache@v2

.github/workflows/sheldon.yaml

@@ -50,7 +50,7 @@ jobs:
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
-        ruby-version: 2.7.1
+        ruby-version: 3.0.0
     - name: but use cache to speed that up
       uses: actions/cache@v2
       with:

.gitignore

@@ -1,2 +1,2 @@
 .env
-spec/sheldon/travis.json
+spec/sheldon/ci.json

Gemfile

@@ -1,4 +1,4 @@
-ruby '2.7.1'
+ruby '3.0.0'
 source 'https://rubygems.org'
 
 gem 'rake'

Gemfile.lock

@@ -1,6 +1,6 @@
 GIT
   remote: https://github.com/citation-style-language/Sheldon.git
-  revision: 0d607983e872e9344c64914277fd7409ac0e29d3
+  revision: 38b6de75ac4dd86d6b3b47c172431e6e44f53ca0
   specs:
     sheldon (1.0.30)
       citeproc-ruby
@@ -93,7 +93,7 @@ DEPENDENCIES
   sheldon!
 
 RUBY VERSION
-   ruby 2.7.1
+   ruby 3.0.0p0
 
 BUNDLED WITH
-   2.1.4
+   2.2.3