Bump rails_failover to 0.2.0.

Bump rails_failover to 0.2.0.

diff --git a/Gemfile.lock b/Gemfile.lock
index 9709a20..6d65777 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -277,7 +277,7 @@ GEM
       nokogiri (>= 1.6)
     rails-html-sanitizer (1.3.0)
       loofah (~> 2.3)
-    rails_failover (0.1.0)
+    rails_failover (0.2.0)
       redis (~> 4)
     rails_multisite (2.1.2)
       activerecord (> 5.0, < 7)

GitHub sha: a2d93960