Make cover images as links and minor updates on README.md

Author: theevilhead

App.js

@@ -78,7 +78,7 @@ class App extends Component {
         </div>
         <div className='footer'>
           <div>
-            <a href='https://hashnode.com?utm_source=chrome_extension&utm_medium=extension' target='_blank' rel='noopener'>My feed</a> · <span>&copy 2019</span>
+            <a href='https://hashnode.com?utm_source=chrome_extension&utm_medium=extension' target='_blank' rel='noopener'>My feed</a> · <span>&copy; 2019</span>
           </div>
           <a href='https://l.hshno.de/chrome-extension-feedback' target='_blank' rel='noopener'>Feedback</a>
         </div>

README.md

@@ -31,7 +31,7 @@ In order to live test the extension copy the `manifest.json` file manually to re
 ----
 
 **To build for production**  
-Run `yarn build`. This time no need to copy manifest file manually. Everything is taken care of.
+Run `yarn build-all`. This builds for both chrome and firefox. This time no need to copy manifest file manually. Everything is taken care of.
 
 ---
 

components/PostCard.js

@@ -31,7 +31,14 @@ export class PostCard extends Component {
     return (
       <div>
         {post.coverImage && (
-          <img className='post-cover' src={post.coverImage} width='100%' />
+          <a
+            href={`https://hashnode.com/post/${post.slug}-${
+              post.cuid
+            }?utm_source=chrome_extension&utm_medium=extension`}
+            target='_blank'
+          >
+            <img className='post-cover' src={post.coverImage} width='100%' />
+          </a>
         )}
         <div className='post-details'>
           <a