Maintenance: Update dependency localhost to v1.3.1

Gemfile.lock

@@ -311,7 +311,7 @@ GEM
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     little-plugger (1.1.4)
-    localhost (1.3.0)
+    localhost (1.3.1)
     logging (2.3.1)
       little-plugger (~> 1.1)
       multi_json (~> 1.14)