Extracted typed response mappings to telegram-bot-types gem

Fixes #75

spec/telegram/bot/client/typed_response_spec.rb

@@ -3,7 +3,7 @@ RSpec.describe Telegram::Bot::Client::TypedResponse do
 
   describe '#get_me' do
     subject { bot.get_me }
-    before { expect(bot).to receive(:request).with(:getMe) { response } }
+    before { expect(bot).to receive(:request).with('getMe') { response } }
     let(:response) { {'ok' => true, 'result' => {'id' => user_id}} }
     let(:user_id) { 123 }
     it { should be_instance_of Telegram::Bot::Types::User }
@@ -17,7 +17,7 @@ RSpec.describe Telegram::Bot::Client::TypedResponse do
 
   describe '#get_updates' do
     subject { bot.get_updates }
-    before { expect(bot).to receive(:request).with(:getUpdates) { response } }
+    before { expect(bot).to receive(:request).with('getUpdates') { response } }
     let(:response) { {'ok' => true, 'result' => [{'update_id' => update_id}]} }
     let(:update_id) { 123 }
     it { should be_instance_of Array }
@@ -29,4 +29,16 @@ RSpec.describe Telegram::Bot::Client::TypedResponse do
       it { expect { subject }.to raise_error Telegram::Bot::Error }
     end
   end
+
+  describe '#delete_webhook' do
+    subject { bot.delete_webhook }
+    before { expect(bot).to receive(:request).with('deleteWebhook') { response } }
+    let(:response) { {'ok' => true, 'result' => true} }
+    it { should eq true }
+
+    context 'on error' do
+      let(:response) { raise Telegram::Bot::Error }
+      it { expect { subject }.to raise_error Telegram::Bot::Error }
+    end
+  end
 end