Update OStatus2 library

Gemfile.lock

@@ -87,7 +87,7 @@ GEM
       warden (~> 1.2.3)
     diff-lcs (1.2.5)
     docile (1.1.5)
-    domain_name (0.5.20160615)
+    domain_name (0.5.20160826)
       unf (>= 0.0.5, < 1.0.0)
     doorkeeper (4.2.0)
       railties (>= 4.2)
@@ -171,7 +171,7 @@ GEM
       pkg-config (~> 1.1.7)
     oj (2.17.3)
     orm_adapter (0.5.0)
-    ostatus2 (0.1.1)
+    ostatus2 (0.2)
       addressable (~> 2.4)
       http (~> 1.0)
       nokogiri (~> 1.6)