fix: added newline

Author: raideer

test-resources/reference/generator/module/module-with-comment.xml

@@ -4,4 +4,4 @@
  -->
 <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
     <module name="Foo_Bar"/>
-</config> 
+</config>

test-resources/reference/generator/observer/events-adminhtml.xml

@@ -5,4 +5,4 @@
     <event name="test_event">
         <observer name="test_observer" instance="Foo\Bar\Observer\TestObserver" />
     </event>
-</config>
+</config>

test-resources/reference/generator/observer/events-with-comment.xml

@@ -8,4 +8,4 @@ Foo_Bar
     <event name="test_event">
         <observer name="test_observer" instance="Foo\Bar\Observer\TestObserver" />
     </event>
-</config>
+</config>

test-resources/reference/generator/observer/events.xml

@@ -5,4 +5,4 @@
     <event name="test_event">
         <observer name="test_observer" instance="Foo\Bar\Observer\TestObserver" />
     </event>
-</config>
+</config>

test-resources/reference/generator/plugin/di-adminhtml.xml

@@ -6,4 +6,4 @@
         <plugin name="test_plugin"
                 type="Foo\Bar\Plugin\TestPlugin" sortOrder="10" />
     </type>
-</config>
+</config>

test-resources/reference/generator/plugin/di.xml

@@ -6,4 +6,4 @@
         <plugin name="test_plugin"
                 type="Foo\Bar\Plugin\TestPlugin" sortOrder="10" />
     </type>
-</config>
+</config>

test-resources/reference/generator/preference/di.xml

@@ -3,4 +3,4 @@
     xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
 
     <preference for="Magento\Catalog\Model\Product" type="Foo\Bar\Model\TestPreference" />
-</config>
+</config>