release 0.2.0 version

support 'del_keys' command

support '-t' option

support '-s' option

enable '-o' and '-v' options

add redis ae event loop

change the output from std err to std out

release 0.1.0 version

Support the follow commands:

cluster_state
cluster_used_memory
cluster_keys_num
slots_state
node_slot_num
new_nodes_name
cluster_rebalance
flushall
cluster_config_get
cluster_config_set
cluster_config_rewrite
node_list