fixed selenium-webdriver dependency for ruby 1.9

Author: Fivell

Gemfile

@@ -23,8 +23,8 @@ group :test do
   gem 'pry'
   gem 'database_cleaner'
   gem 'capybara'
-  gem 'selenium-webdriver'
   gem 'poltergeist'
+  gem 'selenium-webdriver', '< 3.0', platforms: :ruby_19
   gem 'json', '< 2.0', platforms: :ruby_19 # Json 2.0 requires Ruby >= 2.0
   gem 'mime-types', '< 3.0.0', platforms: [:ruby_19, :ruby_20]
   gem 'tins', '< 1.3.4', platforms: :ruby_19

lib/active_admin_import/model.rb

@@ -2,6 +2,7 @@
 # frozen_string_literal: true
 
 require 'rchardet'
+require 'zip'
 
 module ActiveAdminImport
   class Model
@@ -14,7 +15,7 @@ module CONST
       TMP_FILE = 'active-admin-import-unzipped'.freeze
       CSV_TYPES = %w(
         text/csv
-        text/csv
+        text/x-csv
         text/x-comma-separated-values
         text/comma-separated-values
         application/csv