Add Travis CI icon.
Add Travis CI icon.

HatsuneMiku3939/redis,d4rk5eed/redis,vmihailenco/redis,HatsuneMiku3939/redis,superkinglabs/redis,HatsuneMiku3939/redis,icha024/redis,SocialExplorerFork/redis,adjust/redis,cw2018/redis-1,go-redis/redis,HatsuneMiku3939/redis,linkedin-inc/redis,jackyan/redis-1,eyalpost/redis,go-redis/redis