Merge pull request #659 from splitrb/keep-redis-compat-hset

Uset Redis#hmset to keep compatibility with Redis < 4.0

Author: andrehjr

lib/split/experiment.rb

@@ -87,8 +87,8 @@ def save
         persist_experiment_configuration
       end
 
-      redis.hset(experiment_config_key, :resettable, resettable,
-                                        :algorithm, algorithm.to_s)
+      redis.hmset(experiment_config_key, :resettable, resettable,
+                                         :algorithm, algorithm.to_s)
       self
     end