adding gemfile for rails 5.2.3; adding ruby 2.5.1, 2.6.0; trying to dd ruby-head

Author: gaorlov

.travis.yml

@@ -3,6 +3,9 @@ rvm:
   - 2.2.6
   - 2.3.3
   - 2.4.1
+  - 2.5.1
+  - 2.6.0
+  - ruby-head
 env:
   global:
     - CODECLIMATE_REPO_TOKEN=396d4263adb6febf1e6e9b0c0e176fbde35e1a116a3c1ecf8dd4f9384e41979b
@@ -12,6 +15,7 @@ gemfile:
   - gemfiles/4.1.gemfile
   - gemfiles/4.2.gemfile
   - gemfiles/5.0.gemfile
+  - gemfiles/5.2.3.gemfile
 matrix:
   fast_finish: true
   exclude:

gemfiles/5.2.3.gemfile

@@ -0,0 +1,15 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "rake"
+gem "appraisal"
+gem "activesupport", "~> 5.2.3"
+gem "addressable", "~> 2.2"
+gem "codeclimate-test-reporter", :group => :test, :require => nil
+
+group :development, :test do
+  gem "byebug", :platforms => [:mri_20, :mri_21, :mri_22]
+end
+
+gemspec :path => "../"