style(xml): allow black lines in XML files

[skip ci]

Author: nelson6e65

package-lock.json

@@ -22,7 +22,7 @@
     "vuepress": "^1.8.0"
   },
   "devDependencies": {
-    "@prettier/plugin-xml": "^0.12.0",
+    "@prettier/plugin-xml": "^0.13.0",
     "husky": "^4.3.8",
     "prettier": "^2.2.1",
     "prettier-plugin-packagejson": "^2.2.9",

package.json

@@ -2,6 +2,7 @@
 <phpdoc>
   <!-- Title of your project. It will be used to show a mini description -->
   <title>`phpdoc-vuepress` demo</title>
+
   <!-- [1]
   Directories and files from where will be extracted the documentation;
   where your PHP sources are. -->
@@ -12,23 +13,27 @@
     by using <file> tag-->
     <!-- <file>vendor/cakephp/utility/Text.php</file> -->
   </files>
+
   <transformer>
     <!-- [2]
     Directory where the generate documentation files be. Set it according to
     your VuePress config. In this case, it will be used the route `/demo`,
     but you can use any you want -->
     <target>docs/demo</target>
   </transformer>
+
   <transformations>
     <!-- [3] Directory where the template.xml is. In this case, the template.xml file is in that directory -->
     <template name="data/templates/vuepress" />
     <!-- But in your Composer project, you should use the following line instead of the previous one. -->
     <!-- <template name="vendor/nelson6e65/phpdoc-vuepress/data/templates/vuepress" /> -->
   </transformations>
+
   <parser>
     <!-- [4] Elements to include in your documentation by visibility:
          public, protected and private. -->
     <visibility>public,protected</visibility>
+
     <!-- Directory where to put the cache. This can be set to any directory.
          Remember ignore it by Git -->
     <target>build/api-cache</target>