Add compatibility with Rails 6.

.gitignore

@@ -3,3 +3,4 @@ doc
 .yardoc
 pkg
 Gemfile.lock
+gemfiles/*.lock

.travis.yml

@@ -3,32 +3,53 @@ cache: bundler
 sudo: false
 
 gemfile:
-  - gemfiles/rails_3_1.gemfile
-  - gemfiles/rails_3_2.gemfile
-  - gemfiles/rails_4_0.gemfile
-  - gemfiles/rails_4_1.gemfile
-  - gemfiles/rails_4_2.gemfile
   - gemfiles/rails_5_0.gemfile
+  - gemfiles/rails_5_1.gemfile
+  - gemfiles/rails_5_2.gemfile
+  - gemfiles/rails_6_0.gemfile
+  - gemfiles/rails_6_1.gemfile
 
 rvm:
+  - 3.0
+  - 2.7
+  - 2.6
+  - 2.5
+  - 2.4
   - 2.3.1
-  - 2.2
-  - 2.1
-  - 2.0
-  - 1.9
+  - 2.2.2
 
 matrix:
   fast_finish: true
   exclude:
-    - rvm: 1.9
+    - rvm: 2.4
+      gemfile: gemfiles/rails_6_1.gemfile
+    - rvm: 2.3.1
+      gemfile: gemfiles/rails_6_1.gemfile
+    - rvm: 2.2.2
+      gemfile: gemfiles/rails_6_1.gemfile
+    - rvm: 3.0
+      gemfile: gemfiles/rails_6_0.gemfile
+    - rvm: 2.4
+      gemfile: gemfiles/rails_6_0.gemfile
+    - rvm: 2.3.1
+      gemfile: gemfiles/rails_6_0.gemfile
+    - rvm: 2.2.2
+      gemfile: gemfiles/rails_6_0.gemfile
+    - rvm: 3.0
+      gemfile: gemfiles/rails_5_2.gemfile
+    - rvm: 2.7
+      gemfile: gemfiles/rails_5_2.gemfile
+    - rvm: 3.0
+      gemfile: gemfiles/rails_5_1.gemfile
+    - rvm: 2.7
+      gemfile: gemfiles/rails_5_1.gemfile
+    - rvm: 2.6
+      gemfile: gemfiles/rails_5_1.gemfile
+    - rvm: 3.0
       gemfile: gemfiles/rails_5_0.gemfile
-    - rvm: 2.0
+    - rvm: 2.7
       gemfile: gemfiles/rails_5_0.gemfile
-    - rvm: 2.1
+    - rvm: 2.6
       gemfile: gemfiles/rails_5_0.gemfile
-    - rvm: 2.2
+    - rvm: 2.5
       gemfile: gemfiles/rails_5_0.gemfile
-    - rvm: 2.2
-      gemfile: gemfiles/rails_3_1.gemfile
-    - rvm: 2.3.1
-      gemfile: gemfiles/rails_3_1.gemfile

Appraisals

@@ -1,28 +1,24 @@
-appraise "rails-3-1" do
-  gem "test-unit"
-  gem "rails", "~> 3.1.0"
-end
-
-appraise "rails-3-2" do
-  gem "test-unit"
-  gem "rails", "~> 3.2.0"
+appraise "rails-5-0" do
+  gem "rails", "~> 5.0.0"
+  gem "rspec-rails", "~> 4.0"
 end
 
-appraise "rails-4-0" do
-  gem "mime-types", "~> 2.99"
-  gem "rails", "~> 4.0.0"
+appraise "rails-5-1" do
+  gem "rails", "~> 5.1.0"
+  gem "rspec-rails", "~> 4.0"
 end
 
-appraise "rails-4-1" do
-  gem "mime-types", "~> 2.99"
-  gem "rails", "~> 4.1.0"
+appraise "rails-5-2" do
+  gem "rails", "~> 5.2.0"
+  gem "rspec-rails", "~> 5.0"
 end
 
-appraise "rails-4-2" do
-  gem "mime-types", "~> 2.99"
-  gem "rails", "~> 4.2.0"
+appraise "rails-6-0" do
+  gem "rails", "~> 6.0.0"
+  gem "rspec-rails", "~> 5.0"
 end
 
-appraise "rails-5-0" do
-  gem "rails", "~> 5.0.0"
+appraise "rails-6-1" do
+  gem "rails", "~> 6.1.0"
+  gem "rspec-rails", "~> 5.0"
 end

Gemfile

@@ -1,7 +1,3 @@
 source "https://rubygems.org"
 
 gemspec
-
-gem "combustion",  "~> 0.5.4"
-gem "rspec-rails", "~> 3.5"
-gem "appraisal",   "~> 2.1"