Add ruby 2.6 and activesupport 6.0 to CI

Author: fonji

.travis.yml

@@ -5,6 +5,7 @@ cache: bundler
 before_install: gem install bundler
 
 rvm:
+  - 2.6
   - 2.5
   - 2.4
   - 2.3
@@ -14,3 +15,4 @@ gemfile:
   - gemfiles/activesupport_5.0.gemfile
   - gemfiles/activesupport_5.1.gemfile
   - gemfiles/activesupport_5.2.gemfile
+  - gemfiles/activesupport_6.0.gemfile

Appraisals

@@ -13,3 +13,7 @@ end
 appraise "activesupport_5.2" do
   gem "activesupport", "~> 5.2.2"
 end
+
+appraise "activesupport_6.0" do
+  gem "activesupport", "~> 6.0.1"
+end