Release 0.9.0.

Release 0.9.0.

diff --git a/lib/mini_scheduler/version.rb b/lib/mini_scheduler/version.rb
index 0e7a58e..356eb72 100644
--- a/lib/mini_scheduler/version.rb
+++ b/lib/mini_scheduler/version.rb
@@ -1,3 +1,3 @@
 module MiniScheduler
-  VERSION = "0.8.3"
+  VERSION = "0.9.0"
 end

GitHub sha: 114435e8