updating test matrix

.travis.yml

@@ -11,12 +11,13 @@ addons:
 language: ruby
 rvm:
   - 2.3.8
-  - 2.4.5
-  - 2.5.5
-  - 2.6.2
+  - 2.4.9
+  - 2.5.7
+  - 2.6.5
   - ruby-head
 gemfile:
   - test/gemfiles/5.2.gemfile
+  - test/gemfiles/6.0.gemfile
 branches:
   only:
     - master

test/gemfiles/5.2.gemfile

@@ -4,6 +4,8 @@ source "http://rubygems.org"
 
 gemspec path: "../../"
 
+gem "rails", ">= 5.2", "< 6.0"
+
 group :development, :test do
   gem "byebug",             "~> 10.0.0", platforms: %i[mri mingw x64_mingw]
   gem "capybara",           "~> 2.17.0"

test/gemfiles/6.0.gemfile

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+source "http://rubygems.org"
+
+gemspec path: "../../"
+
+gem "rails", ">= 6.0"
+
+group :development, :test do
+  gem "byebug",             "~> 10.0.0", platforms: %i[mri mingw x64_mingw]
+  gem "capybara",           "~> 2.17.0"
+  gem "kaminari",           "~> 1.1.1"
+  gem "puma",               "~> 3.11.2"
+  gem "rubocop",            "~> 0.55.0", require: false
+  gem "selenium-webdriver", "~> 3.9.0"
+  gem "sqlite3",            "~> 1.3.13"
+end
+
+group :test do
+  gem "coveralls",                "~> 0.8.21", require: false
+  gem "diffy",                    "~> 3.2.0"
+  gem "equivalent-xml",           "~> 0.6.0"
+  gem "mocha",                    "~> 1.3.0", require: false
+  gem "rails-controller-testing", "~> 1.0.2"
+end