Update screenshots

README.md

@@ -1,7 +1,7 @@
 ## Tootle
 Simple [Mastodon](https://github.com/tootsuite/mastodon) client for Linux
 
-![Screenshot](https://raw.githubusercontent.com/bleakgrey/tootle/master/data/screenshot.png)
+![Screenshot](https://raw.githubusercontent.com/bleakgrey/tootle/master/data/screenshot1.png)
 
 
 ### Installation

data/com.github.bleakgrey.tootle.appdata.xml.in

@@ -60,7 +60,10 @@
 
   <screenshots>
     <screenshot type="default">
-      <image>https://raw.githubusercontent.com/bleakgrey/tootle/master/data/screenshot.png</image>
+      <image>https://raw.githubusercontent.com/bleakgrey/tootle/master/data/screenshot1.png</image>
+    </screenshot>
+    <screenshot>
+      <image>https://raw.githubusercontent.com/bleakgrey/tootle/master/data/screenshot2.png</image>
     </screenshot>
   </screenshots>