Minor version bump to 0.7.2

[meagar]

Bump to 0.7.2 for release to RubyGems

[andrewloux]

LGTM

[meagar]

It looks like something is up with travis, @dalehamel you're the last person to touch travis.yml and @camilo your previous build failed for the same reason, anybody recognize this? Do we need to change the version of redis being provisioned by travis?

  1) Error:
TestRedis#test_connection_errors_open_the_circuit:
Redis::CommandError: ERR Syntax error, try CLIENT (LIST | KILL | GETNAME | SETNAME | PAUSE | REPLY)
    /home/travis/.rvm/gems/ruby-2.3.1/gems/redis-4.0.0/lib/redis/client.rb:119:in `call'
    /home/travis/.rvm/gems/ruby-2.3.1/gems/redis-4.0.0/lib/redis.rb:210:in `block in client'
    /home/travis/.rvm/gems/ruby-2.3.1/gems/redis-4.0.0/lib/redis.rb:45:in `block in synchronize'
    /home/travis/.rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/monitor.rb:214:in `mon_synchronize'
    /home/travis/.rvm/gems/ruby-2.3.1/gems/redis-4.0.0/lib/redis.rb:45:in `synchronize'
    /home/travis/.rvm/gems/ruby-2.3.1/gems/redis-4.0.0/lib/redis.rb:209:in `client'
    /home/travis/build/Shopify/semian/lib/semian/redis.rb:28:in `initialize'
    /home/travis/build/Shopify/semian/test/redis_test.rb:222:in `new'
    /home/travis/build/Shopify/semian/test/redis_test.rb:222:in `new_redis'
    /home/travis/build/Shopify/semian/test/redis_test.rb:233:in `connect_to_redis!'
    /home/travis/build/Shopify/semian/test/redis_test.rb:46:in `test_connection_errors_open_the_circuit'

[meagar]

Closing in favor of #170