Merge pull request #135 from mizoR/remove-request-class

Remove `Line::Bot::Request` class to make logic clear

Author: mizoR

lib/line/bot.rb

@@ -17,6 +17,5 @@
 require 'line/bot/event'
 require 'line/bot/api/errors'
 require 'line/bot/api'
-require 'line/bot/request'
 require 'line/bot/httpclient'
 require 'line/bot/api/version'

lib/line/bot/api.rb

@@ -12,10 +12,17 @@
 # License for the specific language governing permissions and limitations
 # under the License.
 
+require 'line/bot/api/version'
+
 module Line
   module Bot
     module API
       DEFAULT_ENDPOINT = "https://api.line.me/v2"
+
+      DEFAULT_HEADERS = {
+        'Content-Type' => 'application/json; charset=UTF-8',
+        'User-Agent'   => "LINE-BotSDK-Ruby/#{Line::Bot::API::VERSION}"
+      }.freeze
     end
   end
 end