FIX: Bump onebox to fix soundcloud oneboxes

FIX: Bump onebox to fix soundcloud oneboxes

Followup to a3577435f7da7d97ab7ca6af7339428d41d3a8e1

diff --git a/Gemfile.lock b/Gemfile.lock
index af551ad..53a4d5c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -242,7 +242,7 @@ GEM
     omniauth-twitter (1.4.0)
       omniauth-oauth (~> 1.1)
       rack
-    onebox (2.1.0)
+    onebox (2.1.1)
       addressable (~> 2.7.0)
       htmlentities (~> 4.3)
       multi_json (~> 1.11)

GitHub sha: 6d2b3303