Bump mini_scheduler.

Bump mini_scheduler.

diff --git a/Gemfile.lock b/Gemfile.lock
index 7654514..8f05b67 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -179,7 +179,8 @@ GEM
     mini_portile2 (2.3.0)
     mini_racer (0.2.3)
       libv8 (>= 6.3)
-    mini_scheduler (0.9.0)
+    mini_scheduler (0.9.1)
+      sidekiq
     mini_sql (0.1.10)
     mini_suffix (0.3.0)
       ffi (~> 1.9)

GitHub sha: d7f11be5