Update README.md

Sergej Shafarenka · web-flow · commit cb41213a496f · 2016-08-20T15:52:02.000+02:00
diff --git a/README.md b/README.md
@@ -64,6 +64,7 @@ Used by
 Let us know if you use this library in your application and we will mention it here.
 
 [Grocery Sum][2]
+
 [Slack][3]
 
 License
