adding support to rails 6.1 and fix error of manifest

.travis.yml

@@ -12,6 +12,7 @@ gemfile:
   - gemfiles/rails_5.1.6.gemfile
   - gemfiles/rails_5.2.1.gemfile
   - gemfiles/rails_6.0.0.gemfile
+  - gemfiles/rails_6.1.0.gemfile
 before_script:
   - cp spec/dummy/config/database.yml{.sample,}
   - bundle exec rake db:create db:schema:load db:test:prepare --Rakefile spec/dummy/Rakefile

Appraisals

@@ -21,4 +21,9 @@ end
 appraise "rails_6.0.0" do
   gem "rails", "6.0.0"
   gem "pg", "~> 1.0"
+end
+
+appraise "rails_6.1.0" do
+  gem "rails", "6.1.0"
+  gem "pg", "~> 1.0"
 end

gemfiles/rails_6.1.0.gemfile

@@ -0,0 +1,10 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "pry"
+gem "appraisal"
+gem "rails", "6.1.0"
+gem "pg", "~> 1.0"
+
+gemspec path: "../"

storext.gemspec

@@ -18,7 +18,7 @@ Gem::Specification.new do |s|
   s.test_files = Dir["test/**/*"]
 
   s.add_dependency "virtus"
-  s.add_dependency "activerecord", [">= 4.0", "< 6.1"]
+  s.add_dependency "activerecord", [">= 4.0", "< 6.2"]
 
   s.add_development_dependency "pg"
   s.add_development_dependency "rspec"