fix: docs #245

Author: taoqf

README.md

@@ -10,7 +10,6 @@ no closing `<li>`, `<td>` etc).
 
 ## Install
 
-
 ```shell
 npm install --save node-html-parser
 ```
@@ -86,7 +85,7 @@ Parse the data provided, and return the root of the generated DOM.
     comment: false,            // retrieve comments (hurts performance slightly)
     voidTag:{
       tags: ['area', 'base', 'br', 'col', 'embed', 'hr', 'img', 'input', 'link', 'meta', 'param', 'source', 'track', 'wbr'],	// optional and case insensitive, default value is ['area', 'base', 'br', 'col', 'embed', 'hr', 'img', 'input', 'link', 'meta', 'param', 'source', 'track', 'wbr']
-      addClosingSlash: true     // optional, default false. void tag serialisation, add a final slash <br/>
+      closingSlash: true     // optional, default false. void tag serialisation, add a final slash <br/>
     },
     blockTextElements: {
       script: true,	// keep text content when parsing
@@ -293,7 +292,7 @@ Get class names.
 
 Clone a node.
 
-#### getElementById(id: string): HTMLElement;
+#### getElementById(id: string): HTMLElement
 
 Get element by it's ID.