Use Ruby 2.7 for development and CI

.ruby-version

@@ -1 +1 @@
-2.6.5
+2.7.1

.tool-versions

@@ -1 +1 @@
-ruby 2.6.5
+ruby 2.7.1

.travis.yml

@@ -7,9 +7,10 @@ env:
     - DATABASE_ADAPTER=sqlite3
     - DATABASE_ADAPTER=postgresql
 rvm:
-  - 2.6.5
-  - 2.5.7
-  - 2.4.9
+  - 2.7.1
+  - 2.6.6
+  - 2.5.8
+  - 2.4.10
 gemfile:
   - gemfiles/rails_6_0.gemfile
   - gemfiles/rails_5_2.gemfile
@@ -18,16 +19,26 @@ gemfile:
   - gemfiles/rails_4_2.gemfile
 matrix:
   exclude:
-    - rvm: 2.6.5
+    - rvm: 2.7.1
       gemfile: gemfiles/rails_4_2.gemfile
-    - rvm: 2.4.9
+    - rvm: 2.6.6
+      gemfile: gemfiles/rails_4_2.gemfile
+    - rvm: 2.4.10
       gemfile: gemfiles/rails_6_0.gemfile
 cache: bundler
 # Source: <https://docs.travis-ci.com/user/languages/ruby/#bundler-20>
 before_install:
   - nvm install 12
-  - gem update --system '2.7.8' --no-document
-  - gem uninstall -v '>= 2' -i $(rvm gemdir)@global -ax bundler || true
-  - gem install bundler -v '< 2' --no-document
+#  Use Bundler 1.x for Ruby 2.4/2.5 and Rails 4.2
+  - |
+    if ruby --version | grep -E "2.(4|5)."
+    then
+      gem update --system '2.7.8' --no-document
+      gem uninstall -v '>= 2' -i $(rvm gemdir)@global -ax bundler || true
+      gem install bundler -v '< 2' --no-document
+    else
+      gem update --system --no-document
+      gem update bundler --no-document
+    fi
 install: "bundle install --jobs=3 --retry=3"
 script: "bundle exec rake"

Gemfile

@@ -1,7 +1,7 @@
 source 'https://rubygems.org'
 
 gem 'appraisal', '2.2.0'
-gem 'bundler', '~> 1.1'
+gem 'bundler'
 gem 'pry'
 gem 'pry-byebug'
 gem 'rake', '13.0.1'

Gemfile.lock

@@ -63,7 +63,7 @@ PLATFORMS
 
 DEPENDENCIES
   appraisal (= 2.2.0)
-  bundler (~> 1.1)
+  bundler
   fssm
   pry
   pry-byebug
@@ -77,4 +77,4 @@ DEPENDENCIES
   zeus
 
 BUNDLED WITH
-   1.17.3
+   2.1.4

gemfiles/rails_4_2.gemfile

@@ -3,7 +3,7 @@
 source "https://rubygems.org"
 
 gem "appraisal", "2.2.0"
-gem "bundler", "~> 1.1"
+gem "bundler"
 gem "pry"
 gem "pry-byebug"
 gem "rake", "13.0.1"

gemfiles/rails_5_0.gemfile

@@ -3,7 +3,7 @@
 source "https://rubygems.org"
 
 gem "appraisal", "2.2.0"
-gem "bundler", "~> 1.1"
+gem "bundler"
 gem "pry"
 gem "pry-byebug"
 gem "rake", "13.0.1"

gemfiles/rails_5_0.gemfile.lock

@@ -210,7 +210,7 @@ PLATFORMS
 DEPENDENCIES
   appraisal (= 2.2.0)
   bcrypt (~> 3.1.7)
-  bundler (~> 1.1)
+  bundler
   fssm
   jbuilder (~> 2.5)
   jquery-rails
@@ -239,4 +239,4 @@ DEPENDENCIES
   zeus
 
 BUNDLED WITH
-   1.17.3
+   2.1.4

gemfiles/rails_5_1.gemfile

@@ -3,7 +3,7 @@
 source "https://rubygems.org"
 
 gem "appraisal", "2.2.0"
-gem "bundler", "~> 1.1"
+gem "bundler"
 gem "pry"
 gem "pry-byebug"
 gem "rake", "13.0.1"

gemfiles/rails_5_1.gemfile.lock

@@ -225,7 +225,7 @@ PLATFORMS
 DEPENDENCIES
   appraisal (= 2.2.0)
   bcrypt (~> 3.1.7)
-  bundler (~> 1.1)
+  bundler
   capybara (~> 2.13)
   fssm
   jbuilder (~> 2.5)
@@ -255,4 +255,4 @@ DEPENDENCIES
   zeus
 
 BUNDLED WITH
-   1.17.3
+   2.1.4

gemfiles/rails_5_2.gemfile

@@ -3,7 +3,7 @@
 source "https://rubygems.org"
 
 gem "appraisal", "2.2.0"
-gem "bundler", "~> 1.1"
+gem "bundler"
 gem "pry"
 gem "pry-byebug"
 gem "rake", "13.0.1"

gemfiles/rails_5_2.gemfile.lock

@@ -243,7 +243,7 @@ DEPENDENCIES
   appraisal (= 2.2.0)
   bcrypt (~> 3.1.7)
   bootsnap (>= 1.1.0)
-  bundler (~> 1.1)
+  bundler
   capybara (~> 3.1.1)
   chromedriver-helper
   fssm
@@ -274,4 +274,4 @@ DEPENDENCIES
   zeus
 
 BUNDLED WITH
-   1.17.3
+   2.1.4

gemfiles/rails_6_0.gemfile

@@ -3,7 +3,7 @@
 source "https://rubygems.org"
 
 gem "appraisal", "2.2.0"
-gem "bundler", "~> 1.1"
+gem "bundler"
 gem "pry"
 gem "pry-byebug"
 gem "rake", "13.0.1"

gemfiles/rails_6_0.gemfile.lock

@@ -266,7 +266,7 @@ DEPENDENCIES
   appraisal (= 2.2.0)
   bcrypt (~> 3.1.7)
   bootsnap (>= 1.4.2)
-  bundler (~> 1.1)
+  bundler
   capybara (>= 2.15)
   fssm
   jbuilder (~> 2.7)
@@ -298,4 +298,4 @@ DEPENDENCIES
   zeus
 
 BUNDLED WITH
-   1.17.3
+   2.1.4