Support for rails 6 (#183)

* Update active_admin_import.gemspec * add 6.0.2.2 on 2.7.1 test * ignore ruby low version for rails 6 * fix test * fix bundler * fix ignore

Author: pnghai

.travis.yml

@@ -1,10 +1,15 @@
 script: bundle exec rspec spec
 env:
  matrix:
- - RAILS=5.1.6.2
- - RAILS=5.2.2.1
+ - RAILS=5.2.4.3
+ - RAILS=6.0.3.2
 rvm:
  - 2.4.5
  - 2.5.5
  - 2.6.5
  - 2.7.0
+ - 2.7.1
+jobs:
+ exclude:
+ - rvm: 2.4.5
+ env: RAILS=6.0.3.2

Gemfile

@@ -6,12 +6,12 @@ gemspec
 
 
 group :test do
- default_rails_version = "~> 5.1"
+ default_rails_version = "~> 5.2.4"
  rails_version = ENV['RAILS'] || default_rails_version
  gem 'rails', rails_version
  gem 'rspec-rails'
  gem 'coveralls', require: false # Test coverage website. Go to https://coveralls.io
- gem 'sqlite3',"~> 1.3.6"
+ gem "sqlite3", "~> 1.4.0"
  gem 'launchy'
  gem 'database_cleaner'
  gem 'capybara'

active_admin_import.gemspec

@@ -16,7 +16,7 @@ Gem::Specification.new do |gem|
  gem.require_paths = ['lib']
  gem.version = ActiveAdminImport::VERSION
  gem.add_runtime_dependency 'activerecord-import', '>= 0.27'
- gem.add_runtime_dependency 'rchardet', '~> 1.6'
- gem.add_runtime_dependency 'rubyzip', '~> 1.2'
+ gem.add_runtime_dependency 'rchardet', '>= 1.6'
+ gem.add_runtime_dependency 'rubyzip', '>= 1.2'
  gem.add_dependency 'activeadmin', '>= 1.0.0.pre2'
 end