Only test ruby 2.5 and 2.6

Author: cjmartian

.github/workflows/main.yml

@@ -1,25 +1,6 @@
 name: CI
 on: [push, pull_request, workflow_dispatch]
 jobs:
-  puppet-3-8-7:
-    env:
-      PUPPET_VERSIONS: "3.8.7"
-      PUPPET_VERSION: "3.8.7"
-      RUBOCOP_TEST: false
-      RSPEC_TEST: true
-    runs-on: ubuntu-latest
-    strategy:
-      fail-fast: false
-      matrix:
-        ruby-version: ["2.0", "2.1"]
-    steps:
-      - name: Checkout code
-        uses: actions/checkout@v1
-      - name: Build container
-        run: docker build . --file Dockerfile --tag octocatalog-diff:ruby${{matrix.ruby-version}} --build-arg RUBY_VERSION=${{matrix.ruby-version}}
-      - name: Tests
-        run: docker run -e PUPPET_VERSION -e PUPPET_VERSIONS -e RSPEC_TEST -e RUBOCOP_TEST -e ENFORCE_COVERAGE octocatalog-diff:ruby${{matrix.ruby-version}} /app/script/cibuild
-
   puppet-4-10-10:
     env:
       PUPPET_VERSIONS: "4.10.10"
@@ -30,7 +11,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby-version: ["2.1", "2.2", "2.3"]
+        ruby-version: ["2.5", "2.6"]
     steps:
       - name: Checkout code
         uses: actions/checkout@v1
@@ -49,7 +30,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby-version: ["2.4", "2.5", "2.6"]
+        ruby-version: ["2.5", "2.6"]
     steps:
       - name: Checkout code
         uses: actions/checkout@v1

octocatalog-diff.gemspec

@@ -31,11 +31,11 @@ EOF
   s.add_runtime_dependency 'rugged', '>= 0.25.0b2'
 
   s.add_development_dependency 'rspec', '~> 3.4.0'
-  s.add_development_dependency 'rake', '12.3.1'
+  s.add_development_dependency 'rake', '12.3.3'
   s.add_development_dependency 'parallel_tests', '2.7.1'
   s.add_development_dependency 'rspec-retry', '0.5.0'
 
-  s.add_development_dependency 'rubocop', '= 0.48.1'
+  s.add_development_dependency 'rubocop', '= 0.49.0'
 
   s.add_development_dependency 'simplecov', '~> 0.14.1'
   s.add_development_dependency 'simplecov-erb', '~> 0.1.1'