chore: add budges to doc

Author: pleshevskiy

README.md

@@ -1,7 +1,9 @@
 # genrss
 
+[![PyPI version](https://badge.fury.io/py/genrss.svg)](https://badge.fury.io/py/genrss)
 [![Build Status](https://travis-ci.org/icetemple/genrss.svg?branch=master)](https://travis-ci.org/icetemple/genrss)
 [![Coverage Status](https://coveralls.io/repos/github/icetemple/genrss/badge.svg?branch=master)](https://coveralls.io/github/icetemple/genrss?branch=master)
+[![Documentation Status](https://readthedocs.org/projects/genrss/badge/?version=latest)](https://genrss.readthedocs.io/en/latest/?badge=latest)
 
 RSS generator for python
 
@@ -20,20 +22,20 @@ from datetime import datetime
 from genrss import GenRSS
 
 feed = GenRSS(title='SmartFridge',
-			  site_url='https://smartfridge.me',
-			  feed_url='https://smartfridge.me/feed/rss.xml')
+              site_url='https://smartfridge.me',
+              feed_url='https://smartfridge.me/feed/rss.xml')
 
 feed.item(title='black buns for burgers',
-		  description='For the first time black burgers appeared ' \
-					  'in Japan. Unusual dark color buns complemented ' \
-					  'with black cheese and sauce. Over time, the dish ' \
-					  'has conquered the whole world. The main secret ' \
-					  'ingredient in popular buns is the most common... ' \
-					  'charcoal!',
-		  url='https://smartfridge.me/recipe/316b28-chernye-bulochki-dlya-burgerov/',
-		  author='@smartfridge',
-		  categories=['baking'],
-		  pub_date=datetime.utcnow())
+          description='For the first time black burgers appeared ' \
+                      'in Japan. Unusual dark color buns complemented ' \
+                      'with black cheese and sauce. Over time, the dish ' \
+                      'has conquered the whole world. The main secret ' \
+                      'ingredient in popular buns is the most common... ' \
+                      'charcoal!',
+          url='https://smartfridge.me/recipe/316b28-chernye-bulochki-dlya-burgerov/',
+          author='@smartfridge',
+          categories=['baking'],
+          pub_date=datetime.utcnow())
 
 xml = feed.xml()
 ```