Add server move IP support

lib/ivapi/client/server.rb

@@ -135,6 +135,23 @@ def ptr(options = {})
         get('/json.php', params)
       end
 
+      # Moves additional IP to another server.
+      #
+      # ip        - The String of additional IP.
+      # target_id - The String of another server id.
+      #
+      # Returns the Hash with information.
+      def move_ip(ip, target_id)
+        params = {
+          command: 'server_move_ip',
+          id: server_id,
+          ip: ip,
+          target_id: target_id
+        }
+
+        get('/json.php', params)
+      end
+
       # Send command to change server plan.
       #
       # options - The Hash options (default: {}):

spec/fixtures/server_move_ip.json

@@ -0,0 +1,4 @@
+{
+  "ip": "1.2.3.4",
+  "target_id": 123
+}

spec/ivapi/client/server_spec.rb

@@ -149,6 +149,18 @@
     end
   end
 
+  describe '#move_ip' do
+    let(:move_ip) { Ivapi.server.move_ip('1.2.3.4', 123) }
+    before do
+      stub_command('server_move_ip', id: 3, ip: '1.2.3.4', target_id: 123)
+        .to_return(json_response('server_move_ip.json'))
+    end
+
+    it 'has correct ip address' do
+      expect(move_ip.ip).to eq('1.2.3.4')
+    end
+  end
+
   describe 'change server plan' do
     before(:each) do
       stub_command('server_change', id: 3)