Updated readme and version bump (#14)

* adding getDefaultCategoryTreeId - taxonomy api

* added getCategoryTree and getCategorySubtree

* added getCategorySuggestions and getItemAspectsForCategory

* updated read me and bump version

Author: pajaydev

README.md

@@ -27,6 +27,7 @@ The intent is to simplify the request process by handling the tedious logic. It'
   * [Search Items by Keyword](#searchitemsbykeyword)
   * [Search Items with Free Shipping](#searchitemsbyfreeshipping)
   * [Search Items Based on Price and Condition](#searchitemsbyfilter)
+  * [Taxonomy Api(getDefaultCategoryTreeId, getCategoryTree, getCategorySubtree, getCategorySuggestions)](#taxonomyapi)
 * [Test](#test)
 * [Issues](#issues)
 * [Contribution](#contribution)
@@ -216,6 +217,37 @@ ebay.getAccessToken()
         })
     });
 ```
+## TaxonomyApi
+
+```javascript
+ebay.getAccessToken()
+    .then((data) => {
+        ebay.getDefaultCategoryTreeId("EBAY_US").then((data) => {
+            console.log(data);
+            // for EN_US { categoryTreeId: '0', categoryTreeVersion: '119' }    
+        });
+
+        ebay.getCategoryTree(0).then((data) => {
+            console.log(data);
+            // JSON format of complete category tree.  
+        });
+
+        ebay.getCategorySubtree(0, 11450).then((data) => {
+            console.log(data);
+            // JSON format of complete category sub tree.    
+        });
+
+        ebay.getCategorySuggestions(0, "iphone").then((data) => {
+            console.log(data);
+            // JSON format of category suggestions.    
+        });
+
+        ebay.getItemAspectsForCategory(0, 67726).then((data) => {
+            console.log(data);
+            // JSON format of complete category sub tree.    
+        });
+    });
+```
 
 ## Test
 All test files are present inside test folder. You can run using

package.json

@@ -1,6 +1,6 @@
 {
   "name": "ebay-node-api",
-  "version": "1.0.3",
+  "version": "2.3.1",
   "description": "Ebay node api client",
   "main": "./src/index.js",
   "homepage": "https://github.com/ajay2507/ebay-node-api",
@@ -26,4 +26,4 @@
     "nock": "^9.2.3",
     "sinon": "^4.4.5"
   }
-}
+}