Fixed issue #1996 (Missing '-' in help message for redis-benchmark)
Fixed issue #1996 (Missing '-' in help message for redis-benchmark)

antirez/redis,nnog/redis,yossigo/redis,rogerchina/redis,PKRoma/redis,charsyam/redis,pmem/redis,pmem/redis,ctripcorp/redis,nnog/redis,Sciumo/redis,antirez/redis,yossigo/redis,PKRoma/redis,spinlock/redis,soloestoy/redis,GitHubMota/redis,PKRoma/redis,GitHubMota/redis,antirez/redis,spinlock/redis,ofirluzon/redis,yossigo/redis,oranagra/redis,charsyam/redis,yossigo/redis,neomantra/redis,soveran/redis,ofirluzon/redis,ofirluzon/redis,charsyam/redis,Sciumo/redis,nnog/redis,PKRoma/redis,Sciumo/redis,yossigo/redis,oranagra/redis,GitHubMota/redis,ofirluzon/redis,ofirluzon/redis,rogerchina/redis,neomantra/redis,neomantra/redis,pmem/redis,neomantra/redis,soloestoy/redis,soveran/redis,ctripcorp/redis,spinlock/redis,oranagra/redis,oranagra/redis,neomantra/redis,rogerchina/redis,soloestoy/redis,soveran/redis,charsyam/redis,PKRoma/redis,nnog/redis,rogerchina/redis,ctripcorp/redis,spinlock/redis,charsyam/redis,soloestoy/redis,oranagra/redis,Sciumo/redis,pmem/redis,soloestoy/redis,GitHubMota/redis,soveran/redis,ctripcorp/redis,antirez/redis